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

  • Our Free Plans just got better! | Auth0 Icon
    Our Free Plans just got better! | Auth0

    With up to 25k MAUs and unlimited Okta connections, our Free Plan lets you focus on what you do best—building great apps.

    You asked, we delivered! Auth0 is excited to expand our Free and Paid plans to include more options so you can focus on building, deploying, and scaling applications without having to worry about your security. Auth0 now, thank yourself later.
    Try free now
  • Find Hidden Risks in Windows Task Scheduler Icon
    Find Hidden Risks in Windows Task Scheduler

    Free diagnostic script reveals configuration issues, error patterns, and security risks. Instant HTML report.

    Windows Task Scheduler might be hiding critical failures. Download the free JAMS diagnostic tool to uncover problems before they impact production—get a color-coded risk report with clear remediation steps in minutes.
    Download Free Tool
  • 1
    Apache Cocoon 2.2 Beispiele die im Buch "Apache Cocoon" im dPunkt Verlag beschrieben werden. Beispiele können auch unabhängig vom Buch den Einstieg in Cocoon erleichtern.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 2
    Apache Dubbo

    Apache Dubbo

    A high performance Java RPC framework

    Apache Dubbo is a high performance, lightweight, open source RPC framework written in Java. It offers three key functionalities: interface based remote call, load balancing and fault tolerance, and automatic service registration and discovery. Apache Dubbo is built to support multiple service registries and load balancing strategies right out of the box. Due to its micro-kernel and plugin design it can also be easily extended through third-party implementations. Plenty of companies are using Dubbo, and are helping to continually improve it through Dubbo’s improvement initiative, “Wanted: who’s using dubbo”.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 3
    Apache Flink

    Apache Flink

    Stream processing framework with powerful stream

    Apache Flink is a distributed engine for stateful computations over data streams and batches, designed for low-latency processing at scale. Its core runtime executes dataflow graphs with fine-grained backpressure and checkpointing, allowing applications to recover consistently from failures. Flink’s event-time model and watermarks enable accurate out-of-order processing, windowing, and complex time semantics that typical real-time systems struggle with. Developers program against high-level APIs—DataStream and Table/SQL—to express transformations, joins, and stateful patterns, while specialized libraries support CEP, machine learning workflows, and connectors. A rich connector ecosystem integrates with systems like Kafka, Kinesis, filesystems, JDBC sources/sinks, and object stores. Deployments span Kubernetes, YARN, Mesos, and standalone clusters, and operational features such as savepoints, state backends, and metrics make long-running jobs manageable in production.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    Apache InLong

    Apache InLong

    Apache InLong - a one-stop integration framework for massive data

    Apache InLong is a one-stop integration framework for massive data that provides automatic, secure and reliable data transmission capabilities. InLong supports both batch and stream data processing at the same time, which offers great power to build data analysis, modeling and other real-time applications based on streaming data. InLong (应龙) is a divine beast in Chinese mythology who guides the river into the sea, and it is regarded as a metaphor of the InLong system for reporting data streams. InLong was originally built at Tencent, which has served online businesses for more than 8 years, to support massive data (data scale of more than 80 trillion pieces of data per day) reporting services in big data scenarios. The entire platform has integrated 5 modules: Ingestion, Convergence, Caching, Sorting, and Management, so that the business only needs to provide data sources, data service quality, data landing clusters and data landing formats.
    Downloads: 0 This Week
    Last Update:
    See Project
  • AI-generated apps that pass security review Icon
    AI-generated apps that pass security review

    Stop waiting on engineering. Build production-ready internal tools with AI—on your company data, in your cloud.

    Retool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
    Try Retool free
  • 5
    Apache Sedona

    Apache Sedona

    Cluster computing framework for processing large-scale geospatial data

    Apache Sedona™ is a cluster computing system for processing large-scale spatial data. Sedona extends existing cluster computing systems, such as Apache Spark and Apache Flink, with a set of out-of-the-box distributed Spatial Datasets and Spatial SQL that efficiently load, process, and analyze large-scale spatial data across machines. According to our benchmark and third-party research papers, Sedona runs 2X - 10X faster than other Spark-based geospatial data systems on computation-intensive query workloads. According to our benchmark and third-party research papers, Sedona has 50% less peak memory consumption than other Spark-based geospatial data systems for large-scale in-memory query processing. Sedona offers Scala, Java, Spatial SQL, Python, and R APIs and integrates them into underlying system kernels with care. You can simply create spatial analytics and data mining applications and run them in any cloud environments.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6
    An implementation of an object-oriented UI for Naked Objects framework, implementing using Apache Wicket.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    The Apenmool Framework is a generative programming system to faciliate rapid application development. The specifications of a project are stored in XML and Java files. A code generator is then used to build the application in a variety of configurations.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    Java Enterprise Application which provides web services and database persistence models using JEE standards such as JAX-WS and JPA, using dependency injection provided by Spring Framework. Designed to serve as starting point for JEE development.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    Apollo

    Apollo

    Java libraries for writing composable microservices

    Apollo is a set of Java libraries that we use at Spotify when writing micro-services. Apollo includes features such as an HTTP server and a URI routing system, making it trivial to implement RESTful services. Apollo has been used in production at Spotify for a long time. As a part of the work to release version 1.0.0 we are moving the development of Apollo in to the open. The apollo-api library defines the interfaces for your request routing and request/reply handlers. The apollo-core library manages the lifecycle (loading, starting, and stopping) of your service and defines a powerful module system for adding functionality to an Apollo assembly. You do not usually need to interact directly with apollo-core; think of it merely as “plumbing.” The apollo-http-service library is a standardized assembly of Apollo modules. It incorporates both apollo-api and apollo-core and ties them together with several other useful modules to get a standard API service.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Enterprise-grade ITSM, for every business Icon
    Enterprise-grade ITSM, for every business

    Give your IT, operations, and business teams the ability to deliver exceptional services—without the complexity.

    Freshservice is an intuitive, AI-powered platform that helps IT, operations, and business teams deliver exceptional service without the usual complexity. Automate repetitive tasks, resolve issues faster, and provide seamless support across the organization. From managing incidents and assets to driving smarter decisions, Freshservice makes it easy to stay efficient and scale with confidence.
    Try it Free
  • 10
    AppDriver is a non-invasive framework for the development of Java applications. It uses existing solutions for example Eclipse RCP, Spring, Hibernate to provide the infrastructure for persistence, UI etc. AppDriver works with every kind of POJOs
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    Applacrity is a framework for the rapid development of web applications that provides Ruby on Rails like ease of use combined with the power of the Java and J2EE platform.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    Aracnis is a Java based framework for building distributed web spiders. These spiders can be used to accomplish a variety of tasks, for example, screen-scraping and link integrity checking.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    The Aragon Framework is a generic, module-based SWT Java application framework. It provides several (bound-in) services to support fast application development.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    PROJECT MOVED TO https://nortal.github.io/araneaframework/ Aranea is a Java Hierarchical Model-View-Controller Web Framework that provides a common simple approach to building the web application components, reusing custom or general GUI logic and extending the framework.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    Architecture Application Framework is JavaEE Web Application Development Framework. Rapid Development Using Struts Wrapping Framework and Extends Apache Commons DBUtil JDBC Framework.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    ArchivedLayout separates the GUI description from the business logik. Layouts are described in well-readable XML files and dynamicly bound to Java fields and methods of the underlying program. Created in 2001. Used in several projects. Enjoy.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17
    The Areath project aims to create an easily reusable framework for putting together modernized (but still pleasingly retro) text-based games. Legends of Areath is a full game built using the framework.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18
    Argos is a middleware system that lets you easily create and deploy software components, webpages, widgets, J2ME applications and panels and bind them together into services. Argos uses a microkernel that enables developers to extend the system functiona
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    Argus is a JMX browser and instrument panel viewer designed for the Argos project. Argus is however a generic JMX browser and will work with all JMX enabled systems.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20

    Armature

    Java ARM support for standards, Maven, & archetypes

    The project creates a standard for Java implementations of ARM applications. It uses an asynchronous event model with threading that is standard for any board the runs Java on an ARM processor. The set of interfaces, abstract classes, events and enums create a standard that help enforce the write once, run anywhere credo. This will make code more portable and readable. Main Area: https://sourceforge.net/p/armature/discussion/
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    The Ars Machina Project is a collection of packages with two general goals: to reduce the amount of code needed to implement an application and to suggest some standards to the software architecture and naming of classes and interfaces.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    Artemis-odb

    Artemis-odb

    A continuation of the popular Artemis ECS framework

    Artemis-odb is a high-performance java based Entity-Component-System framework. It is mature, actively maintained, and a continuation of the popular Artemis. Artemis-odb is one of the fastest incarnations of Artemis! Don't take our word for it, check out and run the benchmarks yourself! Dozens of games with sources are available in the Game Gallery! Use it commercially! Expand your toolkit! Easy migration from Artemis clones. Optionally auto-pooled components and hotspot optimization via compile-time bytecode instrumentation. High performance, GC-friendly, less boilerplate! Automatic tracking, and maintenance of entity relationships.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    Artificial Life is a free and open sourced Java framework use to simulate Life. It is a multi-agents framework where each agent runs it is own Thread.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Ascape
    A framework and runtime environment for exploring agent-based models designed to support the definition of models using an expressive, high-level and extensible Java API and to support the exploration of these models in both interactive and batch mod
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Asgard-Core is the base for the Asgrad Integration Test Tool. This plataform, or framework, is designed to allow one to run any action using the power of IoC.
    Downloads: 0 This Week
    Last Update:
    See Project