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

  • Build Agents and Models on One Platform Icon
    Build Agents and Models on One Platform

    Everything you need to build production-ready agents and models. Access 200+ Google and third-party AI models and tools.

    Gemini Enterprise Agent Platform is Google Cloud's comprehensive platform for developers to build, scale, govern, and optimize agents and models. Choose from Google's most advanced models and third-party models like Anthropic's Claude Model Family.
    Start Free
  • Paessler: Easy to Use With Enterprise Power. Free Trial Icon
    Paessler: Easy to Use With Enterprise Power. Free Trial

    A low-code dashboard makes monitoring intuitive for any admin, while scripting and custom sensors give experts full control.

    You shouldn't have to choose between a monitoring tool that's easy to use and one that's powerful enough for a complex environment. PRTG's low-code interface lets any admin build dashboards, set alerts and monitor devices without scripting, while custom sensors and full API access are there when your team needs deeper control. One platform, no compromise. Download a free 30-day trial now.
    Get Free Download
  • 1
    JINAH gathers minimalistic libraries that helps on general Java development, avoiding the rewriting of boilerplate codes and providing base classes, utility classes, and so on.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 2
    JIProlog

    JIProlog

    Java Internet Prolog (Moved to GitHub)

    N.B. THE PROJECT HAS BEEN MOVED TO GITHUB https://github.com/jiprolog/ JIProlog is a cross-platform pure Java 100% Prolog interpreter that integrates Prolog and Java languages in a very fashinating way. JIProlog is compliant with the major Prolog interpreters. It supports most of ISO Prolog specifications and the most common and used built-in predicates, JIProlog allows to call Prolog predicates from Java without dealing with native code (JNI or JNA) and allows to invoke Java methods from Prolog in the same way you call predicates.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 3

    JITBits

    Java commonly used utilset

    Downloads: 0 This Week
    Last Update:
    See Project
  • 4
    JInsect
    The JINSECT toolkit is a Java-based toolkit and library that supports and demonstrates the use of n-gram graphs within Natural Language Processing applications, ranging from summarization and summary evaluation to text classification and indexing.
    Downloads: 0 This Week
    Last Update:
    See Project
  • Train ML Models With SQL You Already Know Icon
    Train ML Models With SQL You Already Know

    BigQuery automates data prep, analysis, and predictions with built-in AI assistance.

    Build and deploy ML models using familiar SQL. Automate data prep with built-in Gemini. Query 1 TB and store 10 GB free monthly.
    Start Free
  • 5
    A Java library for checking german bank account numbers. (Eine Java-Bibliothek zur Überprüfung von deutschen Kontonummern).
    Downloads: 0 This Week
    Last Update:
    See Project
  • 6

    JLCP

    Java Library for Communication Protocols

    This project aims the goal to provide a library to implement in an easy way the communication protocols between applications.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 7
    JLevel

    JLevel

    Kogonuso JLevel - a simple java library that has changed the way html

    Kogonuso JLevel - a simple java library that has changed the way html can be written inside Java(tm) both application and Sevlet. It is a library that is more than your ordinary Html parser applications. It has automated all tagging operations of Html inside java, this means that you are no longer required to learn how to format html String when developing application that requires html in java or even when using Servlet technology to develop your websites. Just import JLevel 2.0 and turn all the tag elements that you have ever known into simple method call. The best is there for you to discover as JLevel not only stripped off tagging in Java html , it has formulated series of shortcuts by abstracting redundant html codes that we have often repeatedly written saving you valuable time. You will no longer dread including html as a formatting tool in your java application when you use JLevel 2.0. Another important feature that JLevel 2.0 has made possible inside java is the abilit
    Downloads: 0 This Week
    Last Update:
    See Project
  • 8
    Various listener types.If file is changed, property present in file gets changed, to see the changes and use these changed values in your running applications.This Java API allows you to use listeners like PropertyChangeListener, FileChangeListener, etc.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 9
    JME (Java Math Expression)

    JME (Java Math Expression)

    Evaluador de expresiones matemáticas para Java en español

    Biblioteca para Java que implementa un potente evaluador matemático en español y un lenguaje estructurado de script, JMEScript, que hace uso de éste. Puede evaluar expresiones altamente complejas, que incluyen; * vectores * matrices * números complejos * números enteros y reales de precisión arbitraria, * expresiones booleanas * conjuntos * cadenas * diccionarios * grafos * correspondencias y relaciones finitas Permite especificar operaciones y funciones definidas por el usuario además de incluir más de 60 operadores predefinidos y más de 450 funciones predefinidas. También implementa un potente modo REPL que permite usar interactivamente la mayoría de características del lenguaje implementado por la biblioteca JME, incluida la importación y exportación CSV, HTML, JSON y XML. Puede consultarse la documentación de usuario y de desarrollador en la página https://miguelalejandromorenobarrientos.github.io/JmeDoc/ IDE JMEScriptGUI https://sourceforge.net/projects/j
    Downloads: 0 This Week
    Last Update:
    See Project
  • Veeam Data Platform v13.1 Icon
    Veeam Data Platform v13.1

    Move workloads across hypervisors and clouds with no vendor lock-in. Try VDP free today.

    Try Veeam Data Platform today. Experience the unified platform that's secure by design, portable by default, and proven to recover clean, fast, and anywhere.
    Try Now
  • 10
    JMacAdapter is a Mac OS X adapter for Java built as a reflective wrapper for com.apple.eawt.*, allowing programs to look and behave like native Mac OS X applications without having to depend on com.apple.eawt.* imports, which are often unavailable.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 11
    JMenuBar Creating Tool (JMBCT)
    Tool for fast and easy javax.swing.JMenuBar object creating. Using this tool you shouldn’t write a lot of messed code, just provide it some external source (like XML document) where you describe its structure in really understandable format.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 12
    JNDbm is a key/value file based database engine a la ndbm, gdbm, etc. NDbm2 uses H2 as a backend.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 13
    JNativeLicense is a free license manager for Java.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 14
    Librería creada para reducir la codificación enla implementación del patrón DataAccessObject con JPA
    Downloads: 0 This Week
    Last Update:
    See Project
  • 15
    JPDF Export
    JPDF Export is a java library built on the famous iText library. It provides simple functions that can be used to build complex pdf files. It also provides simple classes to merge, split and convert pdf files
    Downloads: 0 This Week
    Last Update:
    See Project
  • 16
    Driver para impresor / controlador fiscal EPSON en JAVA. Utiliza JNI para comunicacion con puerto serie. Testeado en winxp, linux x86_64, win7 32 / 64 sobre TMU-220AF. solo rollo papel continuo (chicos)
    Downloads: 0 This Week
    Last Update:
    See Project
  • 17

    JPOSBr

    JavaPOS implementation and more, for Brazilian Retail applications

    jPOSBr has a collection of JAR files that can help you with tasks such as: - Text files creation for the tax authorities (SPED, Sintegra, PAF, etc.) - Communication with business automation equipments, using JavaPOS standard - Issue Slips Bank - Electronic Invoice (NFE) and Electronic Fiscal Coupon (SAT / NFCe)
    Downloads: 0 This Week
    Last Update:
    See Project
  • 18

    JQTray

    Qt based system tray icon for Java.

    Qt based Java System Tray Icon for Linux Systems if you don't like java built-in Tray Icon.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    JRand is an API for validating request parameters in web applications. Validation of parameters is usually a hectic and time consuming process. For documentation and tutorials and how to use Jrand go to : http://www.khaledinho.com/main/?page_id=322
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    JSF component based on SIMILE Timeline see http://www.simile-widgets.org/timeline/. Based of the work at: https://sourceforge.net/projects/jsf-timeline/ which appears to be no longer maintained. Source was derived by decompiling the released jar
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    A jsf charting library depending on JFreeChart. Unlike other libraries, this one allows to get usage of (almost) all JFreeChart features.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    JSON Iterator Java

    JSON Iterator Java

    jsoniter (json-iterator) is fast and flexible JSON parser

    jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go. A good deal of the code is ported from dsljson, and JSON parser. Traditional JSON parsers are slow. Jsoniter Java version could be 3x times faster than jackson/gson/fastjson. If you are doing a lot of log processing or number crunching, but stuck with JSON, you definitely need to consider dsl-json or Jsoniter to save the encoding/decoding cost. Is protobuf 5x faster than JSON?. Jsoniter Golang version could be more than 6x times faster than standard lib (encoding/json). And the number is acheived with runtime reflection instead of go generate.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23

    JSON Search, Other Utilities

    Lightweight utility classes that complement the standard libraries.

    This is a collection of lightweight utility classes. Most of the classes in this package are standalone files without dependencies on other classes inside or outside of this package. Some classes are more procedural than others in the sense that they are simply collections of static methods. Some classes are meant to enforce certain design patterns. This is an ongoing project. Java documentation is available on project website: http://jsonjavasearchmore.sourceforge.net
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Stand-alone Java library implementing parser/formatter/comparator/validator for JSON/XML-like text formats oriented on JSON-like object model (list,map,scalar + reflection). Library is designed to maximize adaptivity via set of extendable modules.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    This is, at least for now, a proof of concept of an extended jsp:include command, allowing the user to pass in both Strings and Objects, as well as specify a block to display if there is an error.
    Downloads: 0 This Week
    Last Update:
    See Project