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
    iText®, a JAVA PDF library

    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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    Downloads: 271 This Week
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  • 2
    Java Curses Library

    Java Curses Library

    JCurses, a java console windowing toolkit for Windows and Linux

    The Java Curses Library (JCurses) is a library for developing text terminal based applications using Java programming language. It is implemented as a Windowing toolkit similar to AWT, but built upon the UNIX "curses" windowing system.
    Downloads: 19 This Week
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  • 3
    CSSBox

    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.
    Downloads: 17 This Week
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  • 4
    openSCADA

    openSCADA

    openSCADA® is an open source SCADA system written in JAVA

    openSCADA is an open source Supervisory Control And Data Acquisition System. It is platform independent and based on a modern system design that provides security and flexibility at the same time. openSCADA is flexible. It is not an out of the box solution, but a set of tools that can be combined in many different ways. It provides development libraries, interface applications, mass configuration tools, front-end and back-end applications. openSCADA is ready to rock. It is used 24/7 in several installations around this world. openSCADA is supported. So if you prefer a fully supported, out of the box instead of a “build it yourself” solution you can contact IBH SYSTEMS GmbH and let us do the job. If you like, you will still get the source code that was developed specially for you. openSCADA needs you. Writing source code, writing documentation, fixing bugs or providing fresh input. Anything is welcome.
    Downloads: 37 This Week
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  • 5
    Moved to https://github.com/DANS-KNAW/dans-dbf-lib.
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    Downloads: 6 This Week
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  • 6
    An open source Java implementation to interpret and render Computer Graphics Metafile (CGM) graphics files.
    Downloads: 8 This Week
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  • 7
    AL-IV

    AL-IV

    ALFOUR Programming language. Simple, safe, power, multi-platform.

    A programming language AL-IV (ALFOUR) is a high-level imperative object oriented programming language with minimal introduction level, easy porting to any platform claiming a very high level of safety and stability, with a controllable level of code protection, high efficiency of an executable code, full independence from a target platform, minimal enter level.
    Downloads: 14 This Week
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  • 8
    openPDF
    openPDF is based on a several open source software products, such as iText, JPedal, CryptoApplet among others. Allow users to view/modify PDF documents and forms, barcodes generation, data extraction and signature validation.
    Downloads: 6 This Week
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  • 9
    Early Access iText, a PDF generation library in Java
    Downloads: 4 This Week
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    Desktop and Mobile Device Management Software

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  • 10

    ULS

    A lexical analyzer generator that makes the class source code.

    ULS is a class library for creating lexical analyzer from language specification file. It's provided as C/C++/C# and Java (class) libraries with a few of tools on Linux/Windows platform.
    Downloads: 6 This Week
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  • 11
    A Message-Passing Interface (MPI) library, allowing a Java application to efficiently run on a distributed, parallel, and high performance architecture. Developed within HPJava project (www.hpjava.org), and maintained by LarKC project (www.larkc.eu)
    Downloads: 2 This Week
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  • 12

    Java-Arduino Communication Library

    Serial Communication between Java and Arduino made simple.

    Serial Communication between Arduino and Java has never been simpler. A better alternative to the RXTX library, the JavaArduinoLibrary is an easy to use library with simple methods that allow you, the JAVA programmer, to read and write from the serial port. Seamless serial communication with the port of your choice. Consists of a class that extends the JComboBox to provide a list of all available ports for selection. Overloaded functions for serialWrite() and serialRead() allow multiple methods of communication. Overloaded constructors and getter and setter methods expand the use case to any scenario. **IMPORTANT**: please download and import both JARs in the files into your project.
    Downloads: 5 This Week
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  • 13
    This project provides utilities to convert a JavaFX Scene to Swing Graphics2D orders. It it then simple to use it to convert to any format which takes a Graphics2D as input. The project comes with a PowerPoint, a SVG, and an EPS converter.
    Downloads: 4 This Week
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  • 14
    JTimeChooser
    A Java JComponent to select the time easily by dragging the mouse or scrolling the mouse wheel, instead of entering the time by keyboard (which is additionally still possible).
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    Downloads: 4 This Week
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  • 15
    silvertunnel - Java lib+browser for TOR
    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/#
    Downloads: 1 This Week
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  • 16

    argparse4j

    Command line argument parser library for Java

    The argparse4j is a command line argument parser library for Java based on Python's argparse.
    Downloads: 1 This Week
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  • 17

    Boss Engine

    8-bit Graphical API for Java

    Boss Engine is a graphical API for writing low-resolution 8-bit color applications. It offers easy to use functions for handling graphics, basic i/o and more. Screen access is performed through virtual framebuffers that allow direct read/write access to indexed color screen data. API is coded entirely with native libraries. No third party libraries required.
    Downloads: 2 This Week
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  • 18
    Nen

    Nen

    neural network implementation in java

    3-layer neural network for regression and classification with sigmoid activation function and command line interface similar to LibSVM. Quick Start: "java -jar nen.jar"
    Downloads: 2 This Week
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  • 19

    Thimble

    An asynchronous task execution library for Java

    Thimble is a multi-thread Executor implementation that supports sequential and coalescing tasks. Sequential tasks are guaranteed to run in order, sequentially (but may run in different threads). Coalescing tasks are tasks where only the latest submitted task needs to be executed (effectively overwriting previously submitted tasks). Sequential and coalescing tasks are mutually exclusive.
    Downloads: 2 This Week
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  • 20
    A Java implementation of a NAT-PMP client. At the project's inception, there was not a well-known NAT-PMP client library for Java. This project intends to fill the gap.
    Downloads: 2 This Week
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  • 21

    jCIFS Filesystem

    Wraps jCIFS as a java filesystem

    This library is a Java 7 filesystem for accessing CIFS/SMB resources over network. Internally it uses jCIFS and hides the library behind the java.nio.file.Path interface and its friends. Please download the newest version of jCIFS from http://jcifs.samba.org/. You can get access to a cifs/smb file simply by using Paths.get(new URI("smb://hostname/share/filename")) and manipulate the returned Path with the utility class java.​nio.​file.​Files. So you can use one API to access local and remote files with your java application. The jCIFS config can be set with the newFileSystem(URI uri, Map<String, ?> env) method of the CIFSFileSystemProvider class.
    Downloads: 1 This Week
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  • 22
    ConnFarm is a high-performance database connection pool. The feature-set includes idle connection management, timeout controls, connection leak debugging capabilities, and JMX monitoring.
    Downloads: 1 This Week
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  • 23

    JFontChooser

    a font chooser component for java.

    a font chooser component for java. provide selection for: 1. font (installed and un-installed) 2. font size 3. font style 4. text 5. text color CHECK OUT AND SUPPORT MY LATEST ANDROID PROJECTS IN HERE: https://play.google.com/store/apps/developer?id=Deepak+PK
    Downloads: 1 This Week
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  • 24
    JUtilClasses

    JUtilClasses

    Java programmer's aid in useful methods and classes

    Util-Classes is a collection of Java classes for programming support in service for building applications. It covers a wide range of topics from simple small routines over Collection classes to larger utilities addressing IO-management, GUI topics and data safety.
    Downloads: 1 This Week
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  • 25
    Just another data-structure library for Java.
    Downloads: 1 This Week
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