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.

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  • 1
    The Eclipse Component Info projects aim is to develop an Eclipse plug-in that offers an easy interface/api to retrieve information on installed components of a running Eclipse instance.
    Downloads: 0 This Week
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  • 2
    EjZip

    EjZip

    Java Lib to zip (compress) or unzip (uncompress) files and folders

    Java Lib to zip (compress) or unzip (uncompress) files and folders. Go to project's wiki to see How to Use and Sample Uses of this lib
    Downloads: 0 This Week
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  • 3
    Elements of Programming Interviews

    Elements of Programming Interviews

    Method stubs and test cases for Elements of Programming Interviews

    This repository contains method stubs and tests of the problems from Elements Of Programming Interviews by Adnan Aziz, Tsung-Hsien Lee, and Amit Prakash. This book is also available in Python and C++. This repository contains solutions to problems from the book "Elements of Programming Interviews," focusing on interview preparation and algorithm practice.
    Downloads: 0 This Week
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  • 4
    Elide

    Elide

    Elide is a Java library that lets you stand up a GraphQL/JSON-API

    Model-driven {json:api} & GraphQL web services for CRUD and Analytics. Elide is a Java library that enables you to stand up JSON API or GraphQL web services in 4 simple steps. Define a JPA annotated model including relationships to other models using Java, Kotlin, Groovy, and other JVM languages. Control access to fields and entities through a declarative, intuitive permission syntax. Make instances of your new model accessible through a top level collection or restrict access only through relationships to other models. And thats it, you are ready to deploy and query your data with JSON or GraphQL requests. Quickly build and deploy production-quality web services that expose your data as a service. Elide APIs support complex filtering rules, sorting, pagination, subscriptions, and text search. Controlling access to your data is as simple as defining your rules and annotating your models.
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  • 5

    Empact Foundation Class Library

    Cross-platform C++ library for use as a default application framework.

    A mature cross-platform C++ library for use as a default application framework. Features include: * Threading & synchronization * Socket programming: SSL, NanoMsg & ZMQ * File I/O utilities: zlib, ini, yaml * Native Database access: MySQL, SQLite, BerkleyDB, Postgre, REDIS and ODBC * Built-in mini XML parser; optional EXPAT, LIBXML and MSXML support * Network protocol stack: HTTP, FTP, SMTP, POP3, SOAP, XMLRPC * Scripting languages: Perl, Python, JavaScript, VBScript, Java, Lua, TCL, Squirrel * Cloud Computing: AWS * Encryption: OpenSSL * Platforms: Linux/Posix, Windows, Arduino * Over 500+ highly reusable classes. 4000+ fully documented functions. Follow the 'Wiki' link above to explore everything about the framework.
    Downloads: 0 This Week
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  • 6
    Enhanced Collections is a thin wrapper around commons collections to allow usage of Java 5 generics. Unlike similar projects, this is not a rewrite of commons collections, just an enhancement on top of it.
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  • 7

    EnterAccess

    Full JAVA JDBC Interface to MS Access using Jackcess

    This JDBC interface serves as a full JAVA interface to MS Access files. It was developed to support the Software-Independent Archival of Relational Databases (SIARD) of the Swiss Federal Institute. It is based on the project Jackcess for accessing MS Access files and makes use of the project H2 for parsing SQL. It is an alternative to the JDBC interface UCanAccess, whose metadata and type support and very limited SQL for DDL and DML queries could not be adapted for the purposes of SIARD. Currently EnterAccess queries are limited to a single table. All DML and DDL queries are limited by the capabilities of Jackcess, which is good at reading a database and weak on creating a view, creating foreign keys, or modifying a schema.
    Downloads: 0 This Week
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  • 8
    The Environment State Virtual Sensors for Android is a library that allows recognition of environmental scenarios in which an Android device can be found. The basic scenarios types are: Motion states, Noise states, Proximity state, ringer-mode state.
    Downloads: 0 This Week
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  • 9
    Epic

    Epic

    Dynamic java method AOP hook for Android

    Epic is a project focused on enabling advanced runtime modifications and enhancements within Android environments, particularly around system behavior and application interaction. It provides tools for hooking and manipulating methods at runtime, allowing developers to intercept and modify application logic dynamically. The framework is designed to work alongside other system-level tools, enabling deeper customization and experimentation. It is commonly used in reverse engineering, debugging, and feature extension scenarios. Epic emphasizes flexibility and control over application execution flow. Its architecture allows developers to explore internal behaviors without modifying original binaries. It serves as a powerful tool for advanced Android development and research.
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  • 10
    Essentials

    Essentials

    General purpose utilities and hash functions for Android and Java

    Essentials is a lightweight collection of high-performance utility classes designed to enhance standard Java and Android development without introducing heavy dependencies. The library focuses on providing efficient data structures and helper utilities that often outperform equivalent components in the standard Java API. It is intentionally minimalistic and is not positioned as a full framework, but rather as a focused toolkit that fills common gaps developers encounter in everyday projects. Essentials emphasizes speed and low footprint, with components such as LongHashMap delivering measurable performance improvements over standard implementations. The library is compatible with both Android and standard Java environments, making it broadly usable across platforms. Overall, Essentials serves developers who want faster and more convenient core utilities without adopting large libraries like Guava or Apache Commons.
    Downloads: 0 This Week
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  • 11
    Estimation Reporting
    Its a pure Java Reporting Library and Reportdesigner for viewing, printing, exporting (xls, pdf, html, rtf) of professional looking reports. Supports Text-, Image- and Chart-Fields, multiple Grouping, XML-Templates and different Datasources.
    Downloads: 0 This Week
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  • 12
    Event Ruler

    Event Ruler

    Java library that allows matching many thousands of Events per second

    Event Ruler (called Ruler in the rest of the doc for brevity) is a Java library that allows matching Rules to Events. An event is a list of fields, which may be given as name/value pairs or as a JSON object. A rule associates event field names with lists of possible values. Event Ruler is a Java library that allows matching many thousands of Events per second to any number of expressive and sophisticated rules.
    Downloads: 0 This Week
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  • 13

    EventBus

    The no.1 event library for Android

    EventBus is an open-source library for Android and Java that uses the publisher/subscriber pattern for loose coupling, enabling central communication to decoupled classes with just a few lines of code. It simplifies communication between Activities, Threads, Services and other components while also simplifying code, eliminating dependencies, and overall improving app development speed and quality. EventBus offers several advanced features, such as jump start, delivery threads, subscriber priorities, and many others. It is specifically optimized for high performance and is small at just ~60k jar. It's been proven by numerous apps with more than a billion total installs.
    Downloads: 0 This Week
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  • 14
    Excel JSP Tag Library
    A JSP taglibray for creating Excel spreadsheets. Based on Apache POI
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  • 15
    Library of exception utils. Introduce exception handlers used to enable an external object to determine how the exceptions should be handled.
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  • 16
    ExpressionJ is a Java library allowing to interpret simple numeric expressions, which may be used in all applications which have to combine numeric values, but do not want to use full-blown scripting languages.
    Downloads: 0 This Week
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  • 17
    You know the component scanning feature of Spring? You'll love this: component scanning as easy as select(javaClasses()).from("your.package").returning(allAnnotatedWith(YourAnnotation.class)). Can support any language running on the JVM. ---------- eXtcos is now also available from Maven Central. To include it into your Maven project just add this dependency: groupId: net.sf.extcos artifactId: extcos version: 0.4b Unfortunately Sourceforge doesn't support XML snippets in the description, so you'll have to build it yourself if needed. ----------- To read the user manual click the website link below.
    Downloads: 0 This Week
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  • 18

    External Java Command Control

    Send commands from the command-line to your running application.

    Moved to GitHub https://github.com/fedups ExCon is a small Java class (a runnable Jar file, “sender”) that you run whenever you need to send a command to your application. Your application needs to include the ExCon “receiver”. The receiver accepts the commands from the ExCon sender and processes them. Since the receiver runs within you application it can access all of your application’s classes and resources.
    Downloads: 0 This Week
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  • 19
    FABRevealMenu

    FABRevealMenu

    A general purpose Android UI library to show a user show menu

    A simple general-purpose UI library to create a custom user-defied menu in a modern way with your favorite Floating action button. It incorporates a lollipop circular reveal view with cool animations somewhat inspired by Google Material Design guidelines.
    Downloads: 0 This Week
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  • 20
    FFJUXS Free Java Universal XML Serializer: The aim of this project is to create a serializer that supports anything the standard Java Serializion supports (not just JavaBeans) - and more - using the XML file format and giving many options.
    Downloads: 0 This Week
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  • 21
    The FFPOJO Project is a Flat-File Parser, POJO based, library for Java applications. IMPORTANT: the source code of this project was migrated to GitHub: https://github.com/gibaholms/ffpojo
    Downloads: 0 This Week
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  • 22
    FFmpeg-Android-Java

    FFmpeg-Android-Java

    Android java library for FFmpeg binary

    FFmpeg Android java is a java library that simplifies your task of using ffmpeg in Android project which I've compiled using FFmpeg-Android.
    Downloads: 0 This Week
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  • 23
    Several language bindings for the FTDI D2XX driver used in FTDI's USB products. Currently supported languages are Python (pyd2xx), Java (jd2xx), CSharp (csd2xx) and LabVIEW (lvd2xx).
    Downloads: 0 This Week
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  • 24

    FXWindowFramer

    A JavaFX library to repaint your Applications window frame.

    Most developer’s wish list probably hosts the idea of exploring new ways of decorating his/her applications window... Of course, preferences of current OSes do propose a few options, but some may want more, or different choices, would it just be to frame their apps with their own uniform “branded” style. FXWindowFramer is a quite simple JavaFX library, which may be used to change the look&feel of a JavaFX application (applying just a few cosmetic changes through CSS definitions), or, as a starting point, to investigate more advanced alternatives... To keep things simple and the prototype easy to understand, FXWindowFramer only touches the application window frame (borders and nameplate), and only supports, as such, desktop applications that do not need resizing. The goal is : Keep the painting intact, but change that frame, keeping it as simple and close to usual JavaFX initialization as possible!
    Downloads: 0 This Week
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  • 25
    FabOptions

    FabOptions

    A multi-functional FAB component with customizable options

    A multi-functional FAB component with customizable options.
    Downloads: 0 This Week
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