Semantic Web Software

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Browse free open source Semantic Web software and projects below. Use the toggles on the left to filter open source Semantic Web software by OS, license, language, programming language, and project status.

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  • 1
    Cube

    Cube

    Universal semantic layer platform for AI, BI, spreadsheets

    Cube is the semantic layer for building data applications. It helps data engineers and application developers access data from modern data stores, organize it into consistent definitions, and deliver it to every application. Cube was designed to work with all SQL-enabled data sources, including cloud data warehouses like Snowflake or Google BigQuery, query engines like Presto or Amazon Athena, and application databases like Postgres. Cube has a built-in relational caching engine to provide sub-second latency and high concurrency for API requests.
    Downloads: 7 This Week
    Last Update:
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  • 2
    Memvid

    Memvid

    Video-based AI memory library. Store millions of text chunks in MP4

    Memvid encodes text chunks as QR codes within MP4 frames to build a portable “video memory” for AI systems. This innovative approach uses standard video containers and offers millisecond-level semantic search across large corpora with dramatically less storage than vector DBs. It's self-contained—no DB needed—and supports features like PDF indexing, chat integration, and cloud dashboards.
    Downloads: 4 This Week
    Last Update:
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  • 3
    Sesame

    Sesame

    Java RDF Framework

    This project is no longer actively maintained. It is succeeded by the Eclipse RDF4J project, which can be found at GitHub and at http://www.rdf4j.org/. Sesame is a de-facto standard framework for processing RDF data. This includes parsing, scalable storage, reasoning and full SPARQL 1.1 query/update support. Sesame offers a fully modular toolkit and an easy-to-use Java API that can be connected to all leading RDF storage solutions.
    Downloads: 3 This Week
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  • 4
    TRAK Metamodel

    TRAK Metamodel

    Tuples (triples) for TRAK architecture viewpoints and views

    The definition of the metamodel for TRAK (defines allowed AD elements and relationships i.e. tuples/ triples for the TRAK viewpoints and views). TRAK is a general systems-thinkers'/system engineering enterprise architecture framework. It is simple, user-friendly, pragmatic and not limited to IT. 100% triple-centric and semantically-sound. Forms basis for RDF + OWL ontology description - see https://trakmetamodel.sourceforge.io/vocab/TRAK_metamodel.html. Each TRAK metamodel element now has its own web page - see https://trakmetamodel.sourceforge.io/metamodel/index.html
    Downloads: 3 This Week
    Last Update:
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  • 5
    Semantic MediaWiki

    Semantic MediaWiki

    Lets you store and query data within the wiki's pages.

    Semantic MediaWiki is an extension to the MediaWiki software (powering Wikipedia), which extends the Wiki with ideas from the Semantic Web. We focus on usability and tight integration. See the web site for further details and GitHub at https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases for the file releases! (since version 2.4.0).
    Downloads: 1 This Week
    Last Update:
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  • 6
    Some tools related to the Music Ontology - including domain-specific Semantic Web crawlers, audio collection management and mapping tools
    Downloads: 3 This Week
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  • 7

    rdf2rdf

    This Java tool converts RDF data from any RDF format to any other.

    This Java tool converts your RDF files from any RDF format to any other format. It is based on the openRDF.org Sesame project and is wrapped into one single jar file for easy usage.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 8
    S-FENG stands for Semantic-FEderation Next Generation. S-FENG represents the solution for managing federation of registries with its related aspects: affiliation, promotion, semantic publication and discovery, according to UDDI 3.0.2 specifications.
    Downloads: 1 This Week
    Last Update:
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  • 9
    SemaRule Navigator
    SemaRule Navigator is an Integrated Suite of Open-Source and Free-License Software, placing Semantic and Text Analysis Technologies in the toolbox of Researchers, Students, and Enterprises.
    Downloads: 2 This Week
    Last Update:
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  • 10

    XML to RDF converter xml2rdf.xsl

    Generic XML to RDF converter

    This is a generic XML to RDF converter which uses XSLT transformations to convert any XML document into RDF format. The transformation uses an XSLT processor like xsltproc. The command line for the Bash shell is: xsltproc xml2rdf3.xsl document.xml > document.rdf Reference: Breitling, F. 2009: A standard transformation from XML to RDF via XSLT, Astronomical Notes, Vol 330 Issue 7, DOI: 10.1002/asna.200811233, http://onlinelibrary.wiley.com/doi/10.1002/asna.200811233/abstract http://adsabs.harvard.edu/abs/2009AN....330..755B https://arxiv.org/abs/0906.2291
    Downloads: 2 This Week
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  • 11

    XMLtoRDF

    Program to transform any XML document to a RDF one.

    Some scenarios for neuroinformatics experiments are saved in standard XML document. This program should be able to parse almost any scenario so far to make a full-valuable RDF file, where every pieces of scenario has their own URI. This project is from University of West Bohemia in Czech republic, required to Fundamentals of Software Engineering (KIV/ZSWI).
    Downloads: 2 This Week
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  • 12
    This project is a reasoner for the description logic EL+. It computes the concept subsumption hierarchy. It is an OWL 2 EL reasoner.
    Downloads: 2 This Week
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  • 13

    JS SmartM3 KP API

    javascript API for SmartM3

    Porting of the SmartM3 Triple Space's KP on JavaScript. Due to limitations on JS connectivity a "WebSocket to TCP" relay has been developed in order to enable JavaScript KP to communicato with a SmartM3 SIB. Relay is based on jWebSocketServer. User manual currently only in italian :(
    Downloads: 1 This Week
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  • 14
    An semantic editor for describing public administration services. Produces ontologies containing a workflow description in owl notation. Can be used for modelling processes in different fields, but was originally focused on semantically describing government services with their corresponding documents, fees and other information items. Launch the editor with Java Web Start at http://ri.tdf.lv
    Downloads: 1 This Week
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  • 15
    RuDolFWSgui is graphical application that lets you add, modify, remove and manage ontologies in a remote Sesame repository server (http://www.openrdf.org) using a remote RuDolFWS server (visit http://sourceforge.net/projects/rudolfws/ ).
    Downloads: 1 This Week
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  • 16

    SPARQL Endpoint interface to Python

    This project has been moved to http://rdflib.github.io/sparqlwrapper/

    A library to allow query a SPARQL end-point in Python
    Downloads: 1 This Week
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  • 17
    Our aim is to enable Web applications to consume linked data from the Web. With SQUIN (Semantic Web Query Interface) we will provide a Web data query service as an addition to the LAMP technology stack. This service executes queries over the whole We
    Downloads: 1 This Week
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  • 18
    Smart-M3 is a functional platform that provides a cross domain search extent for triple based information. Smart-M3 enables smart cross domain applications that rely on information level interoperability.
    Downloads: 1 This Week
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  • 19
    TurtleScript is a semantic web project to demonstrate the utility of including the Turtle RDF serialization in HTML files as a form of metadata. It is intended as proposed alternative or supplement to microformats and RDFa.
    Downloads: 1 This Week
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  • 20
    Web Annotation with Fragment Ids

    Web Annotation with Fragment Ids

    Web Annotation - Mark, Comment, Share

    This Projects aims to create a server-client architecture to make annotation of web elements not only possible, but easy to use. The idea for this project has its roots within a practical software study for the module software Engeneering of the Unisversity of Leipzig, Germany. Under the given liscence we want for everyone interested in supporting or further development to do so. For usage and installation see our [Wiki].
    Downloads: 1 This Week
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  • 21
    ASI to Smart-M3 SIB synchronization agent
    Downloads: 1 This Week
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  • 22
    DB2RDF is a a software tool that will convert data from relational data model to semantic data model (in the form of RDF and RDFS). A SPARQL endpoint for querying the converted data. For querying the semantic data, SPARQL query language is used.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 23
    HERAKLES is a reasoning broker framework for OWL (Web Ontology Language) reasoning systems.
    Downloads: 1 This Week
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    See Project
  • 24
    JSNAV - a library that allows to specify and save some javascript calls in the page's URI. This library helps to standardize the coding javascript URI handler in the anchors. Also it helps to keep the classic navigation anchors.
    Downloads: 1 This Week
    Last Update:
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  • 25

    Java OWL Reader

    Java library which offers information contained in an OWL resource

    A Java library which reads an OWL resource, e.g. an OWL file, and offers methods to get the contained information. For that is has methods to get all OWL classes together with their subclasses and their data types (i.e. their data properties), all relations of these OWL classes (i.e. all object properties), all OWL individuals together with their classes and their data values (i.e. their positive data property assertions) and all relations of these OWL individuals (i.e. all their positive object property assertions).
    Downloads: 1 This Week
    Last Update:
    See Project
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Open Source Semantic Web Software Guide

Open source semantic web software is a type ofprogram which allows users to organize, store, and share data in an easy-to-understand format. This type of software makes use of what are known as semantics or meanings that describe how things and concepts relate to each other. Data stored with open source semantic web software is organized into relationships such as classes, properties, and instances which makes it easier for computers to understand the data.

One advantage of open source semantic web software is that users can create specific schemas, or sets of rules describing how all the data must be organized in order to make sense of it. This feature helps maintain consistency in the quality of the stored information regardless if different people are entering the data or if multiple databases are being used. Another benefit is that new information can easily be added without needing to change existing database structures making it easier for organizations to expand their database capabilities over time.

Additionally, open source semantic web software gives organizations more control over their data by allowing them to define any number of domain models for different purposes including but not limited to customer relations management (CRM), enterprise resource planning (ERP), finance operations and analytics systems, among others. This flexibility empowers users by allowing them tailor their databases according to their individual preferences while still keeping compatibility with industry standards like OWL and RDFa languages.

Finally, another great benefit provided by open source semantic web technology is its security features which protect all confidential user data from unauthorized access or manipulation. By using standard encryption protocols based on public/private key pairs between sender/recipient nodes any transmission over the network will remain secure at all times guaranteeing privacy for anyone who participates in this system.

Features Offered by Open Source Semantic Web Software

  • Resource Description Framework (RDF): RDF is a data model used to represent information as web-based resources. It uses triples, which are statements that consist of a subject, predicate, and object. This allows information to be linked together and accessed in a more organized manner.
  • SPARQL Protocol and RDF Query Language (SPARQL): SPARQL is the language used for querying data from an RDF database. The queries can be run over the web using commands like SELECT, ASK, CONSTRUCT, DESCRIBE and UPDATE. This makes it possible to access large amounts of semantic data quickly and easily.
  • Ontologies: Ontologies are used to describe entities within a certain domain or knowledge area by creating hierarchies of class structure and relationships between classes. This provides more structure for understanding how different types of data connect and helps automate tasks such as classification and reasoning.
  • Reasoners: Reasoners are programs that can process an ontology and make deductions based on the facts stated in it. They can also detect any inconsistencies in the ontology so they can be corrected before use.
  • Natural Language Processing (NLP): NLP tools analyze text written in natural languages like English or Spanish in order to extract structured information from it. For example, they might recognize named entities such as people or organizations mentioned within the text which could then be stored in an ontology or queried using SPARQL commands later on.

Different Types of Open Source Semantic Web Software

  • RDF/XML Parsers: These components of open source semantic web software allow for the conversion of data from one form to another, such as from HTML to XML, or from DBMS to XML.
  • Sparql Query Engines: These components enable Semantic Web developers to write queries in a language (typically SPARQL) that can match up content in distributed databases.
  • Ontology Development Tools: Ontology tools are used to create and maintain network graphs of related concepts, producing a visual representation of knowledge and relationships.
  • Natural Language Processing Libraries: NLP libraries enable developers to process natural language expressions; they also enable machines to interpret human language and generate responses with some degree of understanding.
  • Semantic Reasoning Engines: A reasoning engine helps users build and manage rules that give computers instructions regarding how to act upon certain conditions or events.
  • Knowledge Representation Software: This type of software helps store information in a structured way so it can be easily understood by people, machines, or both. It is especially useful for representing complex information about relationships between different entities like people or organizations.
  • Content Management Systems: Content management systems provide ways for managing digital assets including documents, images, audio and video files on a website or intranet environment while allowing easy collaboration between multiple parties. They also often integrate with other business systems such as those dealing with customer relationship management and enterprise resource planning solutions .

Advantages Provided by Open Source Semantic Web Software

  1. Cost Savings: Open source semantic web software is available for free or at a very low cost compared to proprietary software solutions. This can provide significant savings in both the short and long term, as there are no ongoing licensing fees or maintenance costs associated with open source software.
  2. Scalability: Semantic web technology offers flexibility and scalability that allows developers to quickly grow an application by adding new features and capabilities as needed. For organizations with rapidly changing requirements, the ability to easily scale up and down makes open source semantic web software an attractive option.
  3. Quality Assurance: Many open source projects go through rigorous code reviews, which helps ensure quality code releases. This can be especially beneficial for larger projects where multiple developers may need to access and maintain the same codebase.
  4. Collaboration: The collaborative nature of many open source communities means that you have access to thousands of experienced professionals who can help troubleshoot any issues you may face while developing your semantic web project. Additionally, individuals can contribute their own ideas to improve existing projects or even create entirely new ones.
  5. Security: Open source security measures such as strong encryption protocols are often used in order to protect sensitive data from malicious actors. Since these protocols are typically built into the software’s code base, they make it much more difficult for attackers to bypass them in order obtain private information stored on a server running this type of application.

Types of Users That Use Open Source Semantic Web Software

  • Developers: Use open source semantic web software to create applications, websites, and other programs. They are possible contributors to the software as well.
  • Researchers: Utilize open source semantic web software for research purposes, such as better understanding of data structures or extracting usable information from large datasets.
  • Students: Open source semantic web software is used by students in classes to study different aspects related to computing sciences. The practical exercises they run with this technology can help them develop a deeper understanding of its underlying structure and principles.
  • Hobbyists: People who use open source semantic web software as a passion project or just out of curiosity are hobbyists who want to explore new technologies without any commercial-oriented goals or ambitions.
  • Integrators: Organizations and companies looking for comprehensive solutions make use of open source semantic web software due to its scalability and flexibility in integration with existing systems and platforms.
  • Educators/Instructors: Instructors teaching computer science courses often introduce open source semantic web software into their curriculums to provide students with the opportunity of learning about new technologies in action rather than just theoretical explanations.

How Much Does Open Source Semantic Web Software Cost?

Open source semantic web software is completely free to use. There are no upfront costs associated with any of the open source semantic web software options available. This means you don't have to pay any licensing fees, or purchase a license in order to use the software. Furthermore, since open source software is developed collaboratively by communities of developers, anyone can make improvements and additions to the codebase which can be freely shared with others. As such, there is no need to invest time and resources into developing custom solutions for your particular application or platform. With open source semantic web software you get access to an ever-evolving set of tools that are constantly being optimized and improved without additional cost or effort on your part.

What Software Does Open Source Semantic Web Software Integrate With?

Open source semantic web software can be integrated with a variety of software, including content management systems (CMS), text editors, and search engines. CMS can be used to create and manage webpages, which simplifies the process of building and maintaining websites for those who do not want to write HTML code. Text editors can be used to modify existing texts or documents developed according to Semantic Web standards in an easier way than writing HTML code. Finally, search engines can utilize the data added into Semantic Web databases to develop more complex searches that lead users directly to more relevant results.

What Are the Trends Relating to Open Source Semantic Web Software?

  1. Increased accessibility: Open source semantic web software is becoming more accessible to a wider range of users due to its open source nature. This allows users to customize and modify the software to their needs and requirements, as well as providing a platform for collaboration between developers and users.
  2. Streamlined integration: Open source semantic web software makes it easier for developers to integrate various services, applications, and databases quickly and efficiently. This means that organizations can develop applications faster and with greater scalability.
  3. Enhanced scalability: As open source software continues to become more popular, scalability becomes an increasingly important factor in the development of applications. Scalability refers to the ability of a system to grow and adapt in response to increased demand or load. Open source solutions are highly scalable, allowing developers to create large-scale solutions without significant additional cost or complexity.
  4. Improved customization: Open source solutions allow users to make changes as needed, allowing them to tailor their solutions precisely according to their needs. This means that organizations can create customized solutions without having to invest heavily in developing from scratch.
  5. Greater interoperability: Open source solutions provide better interoperability between different components of the system, making it easier for developers to integrate various pieces into a cohesive whole. This improved interoperability leads to greater flexibility for organizations as they can easily switch components or add new ones without incurring extra costs or effort.

How Users Can Get Started With Open Source Semantic Web Software

Getting started with open source semantic web software is relatively straightforward. Many of the most popular applications are free to access, making it easy to get up and running quickly.

The first step is to find a good platform for hosting your application. You can choose from a variety of options, such as Sandbox or Heroku, or you can host your own server. Once you have chosen a platform, ensure that the necessary software packages are installed, including an RDF parser and query language implementation like Jena or Sesame.

Next, create an ontology for your app's data model by building its classes and relationships in an editor like Protégé. This will provide structure and organization for your application’s data so that it can be understood by other systems or applications. You should also define labels and comments for each class and relationship using natural-language terms that make sense in context; this makes data easier to understand by humans.

Once the ontology is built out, you will need to generate some instance data - sample objects that populate the ontology graph with real-world values - through either manual entry or automated scripts (such as SPARQL). Then you'll want to load this instance data into your chosen triple store solution (e.g., Apache Jena Fuseki). Finally, use one of many available libraries (such as Javascript/NodeJS) to write code which interact with underlying semantic web services in order to utilize their full power in your applications.

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