Open Source Java Libraries
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Java Libraries
View 71 business solutionsBrowse 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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Auth for GenAI | Auth0Easily implement secure login experiences for AI Agents - from interactive chatbots to background workers with Auth0. Auth for GenAI is now available in Developer Preview
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MongoDB Atlas | Run databases anywhereMongoDB Atlas allows you to build and run modern applications across 125+ cloud regions, spanning AWS, Azure, and Google Cloud. Its multi-cloud clusters enable seamless data distribution and automated failover between cloud providers, ensuring high availability and flexibility without added complexity.
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iText®, a JAVA PDF library
PDF Library for Developers
iText is an open-source PDF library available for Java and .NET (C#). iText allows you to effortlessly generate and manipulate standards-compliant PDF documents with a powerful and feature-rich SDK. With iText, you can create archivable and accessible PDFs, split and merge documents, fill and flatten forms, digitally sign documents, and more. iText add-ons enable additional functionality, such as PDF creation from HTML templates, secure redaction, OCR, and much more. The latest versions of iText build on the success of previous versions and feature an improved document engine, high and low-level programming capabilities, and a more efficient modular structure. iText represents the next level for developers looking to leverage PDF in document workflows. The main project page for iText is now on GitHub, and all the latest releases, code samples, open source add-ons and tools, etc. can be found at https://github.com/itext/. -
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ConcatPDF
PDF Concatenation Tool
ConcatPDF is the tool to concatenate PDF files. It can concatenate, extract, encrypt, decrypt, configure PDF files, convert image files to PDF. GUI version and CUI version are both available. iText.NET is iText porting on .NET Framework by J#. This library allows you to generate PDF, (X)HTML, XML, RTF files on Microsoft.NET Framework including ASP.NET. -
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CSSBox
Pure Java HTML / CSS rendering engine
CSSBox is an (X)HTML/CSS rendering engine written in pure Java. Its primary purpose is to provide a complete information about the rendered page suitable for further processing. However, it also allows displaying the rendered document. -
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The ftp4j library implements a Java full-featured FTP client. With ftp4j embedded in your application you can: transfer files (upload and download), browse the FTP site (directory listing), create, delete, rename and move directories and files.
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Powering the best of the internet | FastlyEnsure your websites, applications and services can effortlessly handle the demands of your users with Fastly. Fastly’s portfolio is designed to be highly performant, personalized and secure while seamlessly scaling to support your growth.
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Socket.IO-client Java
A Socket.IO client library for Java
This is the Socket.IO Client Library for Java, which is simply ported from the JavaScript client. The latest artifact is available on Maven Central. There are several ways to handle events that are transmitted between the server and the client. Add the listener function to the end of the listeners array for the event named eventName. Add a one-time listener function for the event named eventName. Remove the specified listener from the listener array for the event named eventName. Remove all listeners for the specific eventName. Remove all listeners (for any event). Besides emitting and listening to events, the Socket instance has a few attributes that may be of use in your application. Each new connection is assigned a random 20-characters identifier. -
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jsoup
Java library for working with real-world HTML
jsoup is a Java library for working with real-world HTML. It provides a very convenient API for fetching URLs and extracting and manipulating data, using the best of HTML5 DOM methods and CSS selectors. jsoup implements the WHATWG HTML5 specification, and parses HTML to the same DOM as modern browsers do. jsoup is designed to deal with all varieties of HTML found in the wild; from pristine and validating, to invalid tag-soup; jsoup will create a sensible parse tree. The parser will make every attempt to create a clean parse from the HTML you provide, regardless of whether the HTML is well-formed or not. You have HTML in a Java String, and you want to parse that HTML to get at its contents, or to make sure it's well formed, or to modify it. The String may have come from user input, a file, or from the web. -
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FSP - File Service Protocol Suite
UDP File transfer protocol
FSP - File Service Protocol. FSP is lightweight UDP based protocol for transferring files. It is designed for anonymous transfers over unreliable networks. -
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UJAC is a collection of Java components that may be useful for your project. It provides a powerful expression interpreter, a iText based document processing engine that generates PDF documents based on XML templates, a charting library and much more.
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Build Securely on AWS with Proven FrameworksMoving to the cloud brings new challenges. How can you manage a larger attack surface while ensuring great network performance? Turn to Fortinet’s Tested Reference Architectures, blueprints for designing and securing cloud environments built by cybersecurity experts. Learn more and explore use cases in this white paper.
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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. -
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silvertunnel.org is a project that provides an end-user browser, a Java library and additional Java security tools to easily access anonymity networks such as the Tor (torproject.org) network. Secure and easy to use. Tor4Java and Tor Browser. Attention: see project status on page https://sourceforge.net/p/silvertunnel/discussion/962278/thread/83dc2d02/#
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HTTP Manager for Android
HTTP Library for GET & POST requests in Android Applications
HTTP Manager for Android allows you manage HTTP requests easy and fast. You have to create just one class with urls and implements one interface. -
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SimpleNet is a small Java network library that should aid in writing fast and lightweight network protocols without having to fuzzle around too much with protocol decisions. It mainly aides in message dispatching and abstraction.
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Aspose Java for Liferay
Provides export options for blogs, journals and dynamic lists
This is Liferay CMS / Portal plugin released by Aspose pty ltd. Aspose.Total Java for Liferay (hook plugin app) provides options for exporting web-contents and blogs created in html to MS-WORD, MS-EXCEL and PDF file formats using Aspose.Total Java APIs. (Aspose.Words, Aspose.Cells and Aspose.PDF) The Plugin also provides very useful functionality / options for exporting the Dynamic Data Lists to MS-WORD, MS-EXCEL and PDF file formats using Aspose.Total Java APIs. (Aspose.Words, Aspose.Cells and Aspose.PDF) -
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AutoDiscovery Library
A tiny library to add auto discovery capability into your applications
A tiny and simple 100% Java library (without any dependency) to easily enable your application to automatically discover the presence of other instances of itself running on the other computers connected to the same LAN network, without having to deal with protocols and network configurations. The protocol used by the library is peer-to-peer, so you don't need a central server. The API is simple, straightforward and there are examples and full documentation to learn it in minutes. -
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Autobahn|Java
WebSocket & WAMP in Java for Android and Java 8
Client library providing WAMP on Java 8 (Netty) and Android, plus (secure) WebSocket for Android. The WebSocket layer is using a callback-based user API, and is specifically written for Android. Eg it does not run any network stuff on the main (UI) thread. The WAMP layer is using Java 8 CompletableFuture for WAMP actions (call, register, publish, and subscribe) and the Observer pattern for WAMP session, subscription and registration lifecycle events. The library is MIT licensed, maintained by the Crossbar.io Project, tested using the AutobahnTestsuite and published as a JAR to Maven and as a Docker toolchain image to Dockerhub. -
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A Java library that provides accelerated downloads of HTTP/HTTPS URIs via the GET and POST methods. Works similar to download managers as requests are made in parallel and chunked for speed.
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This is a JavaScript library which gives the ability to use cryptographic functionality abstracted of available technologies on the browser side. It executes a cryptographic function with the fastest technology including Java, JavaScript and Flash.
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DBZUL
Progect inactive due to lack of user interest
Library for automatic creation of forms for viewing and editing of the given tables of a database. Allows to create ZUL files (zkoss.org) with use of a metainformation of a database. -
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Fast Android Networking
A Complete Fast Android Networking Library that also supports HTTP/2
Fast Android Networking Library is a powerful library for doing any type of networking in Android applications which is made on top of OkHttp Networking Layer. Fast Android Networking Library takes care of each and everything. So you don't have to do anything, just make a request and listen for the response. The recent removal of HttpClient in Android Marshmallow(Android M) made other networking libraries obsolete. No other single library does and everything like making requests, downloading any type of file, uploading file, loading images from the network in ImageView, etc. There are some libraries but they are outdated. No other library provides a simple interface for doing all types of things in networking like setting priority, canceling, etc. As it uses Okio , No more GC overhead in android applications. Okio is made to handle GC overhead while allocating memory. Okio does some clever things to save CPU and memory. -
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A framework for doing asynchronous socket communications - useful for connecting to a large number of hosts in parallel from a single thread. Builds on top of Java NIO library and hides all socket, buffer details.
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Java library implementing simple management of application deployed in Google App Engine. Right now is supported only downloading and parsing of quota details. Which in fact the primary reason of existence of this library.
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Java library to easily use Gure Gipuzkoa's public API. (http://guregipuzkoa.net/api/) Java application to easily upload sets of photos to Gure Gipuzkoa.
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Interfuse is a workflow framework that joins ("fuses") the services, rules and objects of a traditional application with user-defined workflow. Interfuse is lightweight and designed to be embedded in existing Java-based applications.
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A pure java DNS client implementation. Consists of a library and utilities for looking up the Internet domain names. The utilities are also able to fetch an entire domain zone and save it in the standard DNS zone file format.
