Open Source Java Software
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Java Software
Browse free open source Java Software and projects below. Use the toggles on the left to filter open source Java Software by OS, license, language, programming language, and project status.
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Context for your AI agentsBuild data pipelines that feed your AI models and agents without managing infrastructure. Crawl any website, transform content, and push directly to your preferred vector store. Use 10,000+ tools for RAG applications, AI assistants, and real-time knowledge bases. Monitor site changes, trigger workflows on new data, and keep your AIs fed with fresh, structured information. Cloud-native, API-first, and free to start until you need to scale.
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libjpeg-turbo
SIMD-accelerated libjpeg-compatible JPEG codec library
libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON, AltiVec) to accelerate baseline JPEG compression and decompression on x86, x86-64, ARM, and PowerPC systems. On such systems, libjpeg-turbo is generally 2-6x as fast as libjpeg, all else being equal. On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines. In many cases, the performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs. libjpeg-turbo implements both the traditional libjpeg API as well as the less powerful but more straightforward TurboJPEG API. libjpeg-turbo also features colorspace extensions that allow it to compress from/decompress to 32-bit and big-endian pixel buffers (RGBX, XBGR, etc.), as well as a full-featured Java interface. -
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Firebird
A powerful, cross platform, SQL database system
Firebird RDBMS offers ANSI SQL features & runs on Linux, Windows & several Unix platforms. Features excellent concurrency & performance & powerful stored procedure & trigger language. More information and downloads at https://firebirdsql.org/, issue tracker is https://github.com/FirebirdSQL/firebird/issues -
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OpenCV
Open Source Computer Vision Library
The Open Source Computer Vision Library has >2500 algorithms, extensive documentation and sample code for real-time computer vision. It works on Windows, Linux, Mac OS X, Android, iOS in your browser through JavaScript. Languages: C++, Python, Julia, Javascript Homepage: https://opencv.org Q&A forum: https://forum.opencv.org/ Documentation: https://docs.opencv.org Source code: https://github.com/opencv Please pay special attention to our tutorials! https://docs.opencv.org/master Books about the OpenCV are described here: https://opencv.org/books.html -
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Cool Reader
A cross-platform XML/CSS based eBook reader
CoolReader is fast and small cross-platform XML/CSS based eBook reader for desktops and handheld devices. Supported formats: FB2, TXT, RTF, DOC, TCR, HTML, EPUB, CHM, PDB, MOBI. Platforms: Win32, Linux, Android. Ported on some eInk based devices. -
Atera all-in-one platform IT management software with AI agentsAtera’s AI agents don’t just assist, they act. From detection to resolution, they handle incidents and requests instantly, taking your IT management from automated to autonomous.
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SymmetricDS
Database Replication, Filtered Synchronization, and Transformation
SymmetricDS is database replication and file synchronization software. It is a platform-independent, web-enabled, and database-agnostic synchronization tool. With initial data load, bidirectional change data capture, conflict resolution, and data transformation, it is a comprehensive data replication solution. -
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FrostWire
Search, Download, Play, Share on Bittorrent and the cloud
FrostWire https://www.frostwire.com/ is a media player, Video Downloader and Peer to Peer (P2P) information sharing client for the BitTorrent network. This project is not affiliated with LimeWire LLC. FrostWires' source code is Licensed under the GNU GPL and Apache Open Source licenses. System Requirements Any of the following operating systems: ● Windows 10, 8, 7, Vista for Intel processors (64-bit only) ● Mac OS X 10.11 (El Capitan) or later (64-bit) ● Linux, Unix such as Solaris (64-bit) ● Android 7.0 or later 256 MB of RAM (512 MB Recommended) An active internet connection -
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Domination (Risk Board Game)
Domination is a game that is a bit like the board game Risk
Domination is a game that is a bit like the well known board game of Risk or RisiKo. It has many game options and includes many maps. Written in java it includes a map editor, a simple map format, multiplayer network play, single player, hotseat, 5 user interfaces and many more features, it works in all OSs that run java 1.5 or higher, iOS and Android. -
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EMV NFC Paycard Enrollment
A Java library used to read and extract data from NFC EMV credit cards
Java library used to read and extract public data from NFC EMV credit cards. -
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FastPhotoTagger
A fast way to set photo metadata tags
FastPhotoTagger tries to be the fastest way to set the metadata in your photos. Add, change, delete, and search the metadata fields of your choice. FastPhotoTagger excels when you have lots of files and lots of metadata. With FastPhotoTagger, you can - Set multiple images to have the same tags - Set individual images to have unique tags - Display all the metadata in an image - Compare and edit all the metadata in several images - Work with your favorite metadata fields: EXIF, XMP, IPTC, etc. - Define hierarchical keywords - View images and slideshows that display tags as captions - Create and search a metadata database FastPhotoTagger has versions for PC and Android. FastPhotoTagger uses ExifTool to read & write metadata, HyperSQL to manage its database, dcraw to display DNG & RAW, and ImageMagick to display TIFF. WEBP, & HEIC. -
Grafana: The open and composable observability platformGrafana is the open source analytics & monitoring solution for every database.
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FreeWRL is an Open Source, cross platform VRML2 and X3D compliant browser, with script, SAI and EAI support. Platforms supported: Linux and other Unix-style platforms; Mac OS/X; Windows. Support for mobile platforms (iOS, Android, QNX) is under development.
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An Open Source model rocket simulator.
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DictionaryForMIDs
Dictionary for Mobile Information Devices and PCs
DictionaryForMIDs is an dictionary application for cell phones, tablets and PCs. The dictionary is completely installed on the device ("offline dictionary"), i.e. after installation there is no need for an internet connection. DictionaryForMIDs can be set up for any dictionary, for any language, or for any other lookup-purpose. The DfM-Creator tool is used to set up a dictionary for use with DictionaryForMIDs. -
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OpenNMS
A Java based fault and performance management system
An Enterprise-Grade Network Management Application Platform that is 100% Free and Open Source Software. -
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RECOIL
Retro Computer Image Library
Retro Computer Image Library decodes Amiga, Amstrad CPC, Apple II, Atari 8-bit, Atari Portfolio, Atari ST/TT/Falcon, BBC Micro, Commodore 64, Commodore 16/116/Plus4, Commodore 128, Electronika BK, FM Towns, HP 48, Macintosh 128K, MSX, NEC PC-80/88/98, Oric, SAM Coupe, Sharp X68000, Tandy 1000, Timex 2048, TRS-80, TRS-80 Color Computer, ZX81 and ZX Spectrum picture formats. The project contains a simple viewer, plug-ins for general-purpose image viewers and editors, and an everything-to-png converter. -
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ASAP (Another Slight Atari Player) plays and converts 8-bit Atari music (*.sap, *.cmc, *.mpt, *.rmt, *.tmc, ...) on modern computers and mobile devices.
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Universal Password Manager
Store all your passwords in one secure encrypted database.
Universal Password Manager allows you to store all your passwords in one highly secure encrypted database. Its strengths are simplicity, portability and security (uses 128bit AES encryption). UPM is available on Android, Windows, OS X & Linux. -
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UnboundID LDAP SDK for Java
A Java-based LDAP API
A fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication. -
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WebRTC Android
webrtc VideoCall VideoConference
WebRTC Android is a sample project that showcases how to implement real-time peer-to-peer communication (audio, video, and data) on Android using WebRTC. It demonstrates a complete pipeline—from signaling and connection setup to media capture and transmission—making it an excellent reference for developers looking to integrate WebRTC into their mobile apps. The project includes UI components and handles network state changes, codec configuration, and ICE negotiation to provide a robust base for real-world applications. -
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This project provides a generic CDS (or ARINC 661 Server), coded in the Java language in order to facilitate the understanding of the ARINC 661 standard, prototype ARINC 661 concepts and architectures, etc… This project is managed by Dassault Aviation.
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encrypt
cross-platform, encryption application
encrypt is a multi-platform, file encryption application. Binary packages are currently provided for Arch, Debian, Fedora, MS Windows, Android and OS X. For further details, including the latest source code, visit https://albinoloverats.net/projects/encrypt -
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GSYVideoPlayer
Android video player library
GSYVideoPlayer is a flexible, feature-rich video playback library for Android that wraps popular media engines to offer a unified, customizable API. It supports full-screen playback, small-window (picture-in-picture–style) modes, and seamless orientation changes with proper lifecycle handling. The library provides gesture controls for brightness, volume, and seeking, along with thumbnail covers, playback speed adjustment, and caching options for smoother viewing on unreliable networks. Developers can embed players in RecyclerView lists, wire custom controls, and switch underlying renderers or decoders to match device capabilities and formats. Hooks for callbacks and state listeners make it straightforward to integrate analytics, preloading, and error recovery into apps. With a modular design and extensive demos, GSYVideoPlayer serves both as a practical production player and as a reference for building polished media experiences on Android. -
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Xabber
Open-source XMPP client for Android
Open source Jabber (XMPP) client with multi-account support, clean and simple interface. Being both free (as in freedom!) and ad-free, Xabber is designed to be the best Jabber client for Android. Xabber uses Gradle build system. The only specific thing is git submodule for the MemorizingTrustManager library. Since it’s inception in 2011, Xabber has grown to be a number one XMPP client for Android. It is fast, reliable and packed with lots of features that make it more advanced than most desktop clients. Xabber interface was perfected over many years to give a very clear yet informative presentation of your contacts and chats. Great amount of details are shown in a subtle way to not obscure your view. Internet connection is not as reliable as we’d like on mobile networks, users often experience connection loss. Xabber for Android was optimized to ensure low battery usage and to quickly reconnect. -
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JLibModbus - Java Modbus Library
A modbus library implemented in Java.
JLibModbus is an implementation of the Modbus protocol v1.1b in java language. The library supports the most popular communication libraries (jssc, rxtx, jSerialComm, purejavacomm, java comm api); Maven dependency: <dependency> <groupId>com.intelligt.modbus</groupId> <artifactId>jlibmodbus</artifactId> <version>1.2.9.7</version> </dependency> Implemented MODBUS functions: 0x01 Read Coils 0x02 Read Discrete Inputs 0x03 Read Holding Registers 0x04 Read Input Registers 0x05 Write Single Coil 0x06 Write Single Register 0x07 Read Exception Status 0x08 Diagnostics 0x0B Get Comm Event Counter 0x0C Get Comm Event Log 0x0F Write Multiple Coils 0x10 Write Multiple Registers 0x11 Report Slave Id 0x14 Read File Record 0x15 Write File Record 0x16 Mask Write Register 0x17 Read Write Multiple Registers 0x18 Read Fifo Queue 0x2B Encapsulated Interface Transport (Read Device Identification interface) -
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OpenOrienteering
Former project page
See https://www.openorienteering.org/apps/mapper/ -
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Mobile Open-Source Software and Tools
Android, UIQ 3.0, Series 60 Edition 5 open-source software
Android, Symbian UIQ 3.0 and Symbian Series 60 Edition 5 open-source software, tools, libraries and themes. Most notable the FX-602P / FX-603P Simulator and the HP-45 Emulator are hosted here.
