Open Source Java Software - Page 25
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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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Aegis Authenticator
A free, secure and open source app for Android
Aegis Authenticator is a free and open-source two-factor authentication (2FA) app for Android that helps users secure their online accounts by generating cryptographic one-time passwords (OTPs) such as TOTP and HOTP codes. Unlike many proprietary MFA apps, Aegis is designed with user privacy and local control in mind, storing secrets only on the device in an encrypted vault protected by PIN or biometric unlock, and offering features like backups encrypted with a user-chosen passphrase. It supports importing accounts from QR codes, exporting encrypted backups for safe storage, and grouping or labeling tokens so managing dozens of accounts is simple. Aegis also offers options for custom token configuration, including changing issuer names, digits, and intervals, and includes a robust recovery mechanism in case a device is lost. It has a material design interface that makes navigation intuitive, and its open-source license ensures transparency. -
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Agents-Flex
Agents-Flex is an elegant LLM Application Framework like LangChain
Agents-Flex includes a variety of network protocols for connecting LLMs, such as HTTP, SSE and WS. Its simple and flexible design allows developers to easily connect to various LLMs, including OpenAI, LLama, and other AI. Agents-Flex provides a rich set of development templates and Prompt Frameworks, including FEW-SHOT, CRISPE, BROKE, and ICIO. Developers can also customize their own unique prompt templates. Agents-Flex has a very flexible Function Calling component. It supports local method definitions, parsing, callbacks through LLMs, and executing local methods to obtain results. Agents-Flex offers Loader, Parser, and Splitter components for the Document. Each component has multiple implementations, making it easy to load data from the web, local files, databases, and various data types. -
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AntennaPod
Open source podcast manager for Android
AntennaPod is a flexible and open-source podcast manager for Android that’s really simple and easy to use. It lets you listen to and download thousands of podcasts without having to use a browser. It’s got all the features you would need, and none of the crap you don’t. Its features include automatic download and playback with variable speed, RSS and Atom feeds, OPML import and export, Flattr integration and more! AntennaPod is currently being tested to work on a number of different combinations of Android versions, phones and use cases. It is also being translated in various languages through its Transifex project page. -
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Apache SkyWalking
Application Performance Monitoring System
Apache SkyWalking is an open source application performance monitoring system designed specifically for microservices, as well as cloud-native and container-based(Docker, Mesos, Kubernetes) architectures. It is capable of monitoring, tracing and diagnosing distributed systems in cloud native architectures. Apache Skywalking supports the collection of telemetry data from a number of different sources and in different formats, such as Java, .NET Core, PHP, LUA agent and more. It also offers a solid core features set, which includes root cause analysis, service topology map analysis, performance optimization, and many more. -
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Applied Energistics 2
A Minecraft Mod about Matter and Energy
Applied Energistics 2 (AE2) is a comprehensive mod for Minecraft that introduces a unique approach to in-game inventory management. Its theme is centered around the concept of converting matter into energy and vice versa, to store and transport your items and fluids instantaneously. AE2 revolutionizes storage in Minecraft. The mod adds a network-based digital storage system, where items and blocks are stored as energy in a digital form within a network of connected devices. This allows for compact storage solutions and easy access to your items. Another significant feature of AE2 is its automatic crafting capabilities. Players can set up patterns and recipes which the system can automatically craft on demand. This greatly streamlines bulk and complex crafting processes, saving time and effort. AE2 adds a whole new level of strategy to your Minecraft builds with its networking and channel system. -
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Bisq
A decentralized bitcoin exchange network
Buy and sell bitcoin for fiat (or other cryptocurrencies) privately and securely using Bisq's peer-to-peer network and open-source desktop software. No registration is required. Get started in minutes. No need to wait for approval from a central authority. Trading takes place on a global P2P network of users running Bisq on their own machines. Bisq never holds your funds. Deposits held in 2-of-2 multi-sig wallets encourage safe, successful trades. Your data is stored locally on disk, and is never sent to a central server. Every Bisq node is a Tor hidden service by default. Code is open-source, and project strategy is discussed openly on Keybase and GitHub. We've made all this sophistication simple, make your first trade in under 10 minutes! Decentralized governance for a decentralized exchange, built on top of Bitcoin. -
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Chat2DB
AI-driven database tool and SQL client
Save time by working with data. Connect to all your data sources, and instantly generate optimal SQL for fast lightning information. If you don't know SQL well, you can get instant information without writing SQL. Generate high-performance SQL for your complicated queries using natural language, as well as correcting errors and getting AI suggestions to optimize the performance of SQL queries. Developers can write complex SQL queries quickly and accurately with the help of the AI SQL editor, saving time and improving development efficiency. Just enter the names of the tables and columns, and we will automatically configure the type, password, and comment, saving you 90% of the time. Imports and exports data in multiple formats (CSV, XLSX, XLS, SQL) to facilitate exchange, backup, and migration. Transfers data between different databases or through cloud services, as a backup and recovery solution that guarantees the minimum loss of data and downtime during migrations. -
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ChatGPT Java
A Java client for the ChatGPT API
ChatGPT Java is a Java client for the ChatGPT API. Use official API with model gpt-3.5-turbo. -
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Conversations
The very last word in instant messaging
Conversations is an open source Jabber/XMPP client for Android, designed to provide a unique and more freeing mobile messaging experience. XMPP is a federated protocol that can work with every XMPP server out there, giving you the freedom to choose a trustworthy server for yourself while still being able to chat with contacts from other servers. All communications are TLS encrypted and Conversations offers to enable one of two state of the art end-to-end encryption mechanisms, so you can be assured of the highest level of security in messaging. Conversations also offers plenty of unique features, such as image sharing, read markers, dynamic history loading and more. -
AI-generated apps that pass security reviewRetool lets you generate dashboards, admin panels, and workflows directly on your data. Type something like “Build me a revenue dashboard on my Stripe data” and get a working app with security, permissions, and compliance built in from day one. Whether on our cloud or self-hosted, create the internal software your team needs without compromising enterprise standards or control.
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Forge: Magic: The Gathering Rules Engine
An unofficial rules engine for the world's greatest card game
Forge is a comprehensive open-source rules engine and gameplay platform designed to simulate and extend the card game Magic: The Gathering in a fully digital environment. Developed collaboratively by a community of contributors, it implements the vast majority of the game’s rules and card interactions, allowing players to experience both casual and competitive gameplay without official clients. The software supports multiple play modes, including single-player against AI opponents, multiplayer sessions, and even adventure-style gameplay modes that expand beyond traditional card duels. Its architecture is highly extensible, enabling developers to script new cards, create custom sets, and modify gameplay mechanics through its API and scripting system. Forge includes tools for deck building, card searching, and automated gameplay assistance, making it accessible to both new players and experienced enthusiasts. -
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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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Google Santa Tracker for Android
Educational and entertaining tradition that brings joy to children
Google Santa Tracker app for Android is an educational and entertaining tradition that brings joy to millions of children (and children at heart) across the world over the December holiday period. The app is a companion to the Google Santa Tracker website (repository here), showcasing unique platform capabilities like Android Wear watchfaces, device notifications and more. First up, Santa Tracker is powered by Firebase, so you'll need to enable it on your Google account over at the Firebase console. A beautiful designed village. Exciting games like Penguin Swim and Rocket Sleigh. Use of Dynamic Feature Modules (each game is a separate module, fetched dynamically on first run). Interactive Android Wear watchfaces (with sound!). Videos, animations and more. -
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J2ObjC
A Java to iOS Objective-C translation tool and runtime
J2ObjC is an open-source command-line tool from Google that translates Java source code to Objective-C for the iOS (iPhone/iPad) platform. This tool enables Java source to be part of an iOS application's build, as no editing of the generated files is necessary. The goal is to write an app's non-UI code (such as application logic and data models) in Java, which is then shared by web apps (using GWT), Android apps, and iOS apps. J2ObjC supports most Java language and runtime features required by client-side application developers, including exceptions, inner and anonymous classes, generic types, threads and reflection. JUnit test translation and execution is also supported. J2ObjC cannot convert Android binary applications. Developers must have source code for their Android app, which they either own or are licensed to use. -
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JFlex
The fast scanner generator for Java™ with full Unicode support
JFlex is a lexical analyzer generator for Java, designed to create fast and efficient scanners. It takes regular expression specifications and produces Java code for tokenizing input text. -
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JMX Exporter
A process for exposing JMX Beans via HTTP for Prometheus consumption
JMX to Prometheus exporter: a collector that can configurable scrape and expose mBeans of a JMX target. This exporter is intended to be run as a Java Agent, exposing a HTTP server and serving metrics of the local JVM. It can be also run as a standalone HTTP server and scrape remote JMX targets, but this has various disadvantages, such as being harder to configure and being unable to expose process metrics (e.g., memory and CPU usage). Running the exporter as a Java agent is strongly encouraged. -
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JOML
A Java math library for OpenGL rendering calculations
JOML is a high-performance, lightweight math library designed for 3D graphics applications in Java, particularly those using OpenGL, Vulkan, or LWJGL. It provides a complete suite of vector, matrix, quaternion, and geometry operations essential for real-time graphics and game development. Unlike other math libraries, JOML avoids object allocation during calculations, making it highly optimized for garbage-free performance. With precise control over mathematical operations and compatibility with low-level APIs, JOML is a go-to library for Java developers working on real-time 3D engines and simulations. -
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Karate
Test automation made simple
Karate is the only open-source tool to combine API test-automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral, and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed. There’s also a cross-platform stand-alone executable for teams not comfortable with Java. You don’t have to compile code. Just write tests in a simple, readable syntax, carefully designed for HTTP, JSON, GraphQL and XML. And you can mix API and UI test-automation within the same test script. A Java API also exists for those who prefer to programmatically integrate Karate’s rich automation and data-assertion capabilities. It is worth pointing out that JSON is a ‘first class citizen’ of the syntax such that you can express payload and expected data without having to use double-quotes and without having to enclose JSON field names in quotes. -
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Kestra
Kestra is an infinitely scalable orchestration and scheduling platform
Build reliable workflows, blazingly fast, deploy in just a few clicks. Kestra is an open-source, event-driven orchestrator that simplifies data operations and improves collaboration between engineers and business users. By bringing Infrastructure as Code best practices to data pipelines, Kestra allows you to build reliable workflows and manage them with confidence. Thanks to the declarative YAML interface for defining orchestration logic, everyone who benefits from analytics can participate in the data pipeline creation process. The UI automatically adjusts the YAML definition any time you make changes to a workflow from the UI or via an API call. Therefore, the orchestration logic is defined declaratively in code, even if some workflow components are modified in other ways. -
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Minestom
1.21.11 Lightweight Minecraft server
Minestom is an open-source Minecraft server development framework that allows developers to build custom Minecraft server software from scratch without relying on Mojang’s original server code. Instead of functioning as a traditional server implementation, Minestom acts as a lightweight library that provides the core networking and gameplay infrastructure needed to create Minecraft server applications. Developers can use it to design custom game modes, experimental server architectures, or entirely new gameplay systems while maintaining compatibility with the Minecraft Java Edition client. The framework focuses on performance, modularity, and extensibility, allowing developers to include only the features required for their specific server projects. Because Minestom is designed with a minimal base architecture, it enables high performance and easier scalability for custom server environments. -
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Mohist
Minecraft Forge Hybrid server implementing the Spigot/Bukkit API
MohistMC is dedicated to pushing boundaries by accomplishing the impossible through the creation of unique hybrid Minecraft software. Additionally, we strive to maintain and enhance select mods and plugins, aiming to provide players with an exceptional gaming experience. -
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ODD Platform
First open-source data discovery and observability platform
Unlock the power of big data with OpenDataDiscovery Platform. Experience seamless end-to-end insights, powered by unprecedented observability and trust - from ingestion to production - while building your ideal tech stack! Democratize data and accelerate insights. Find data that fits your use case and discover hints left by your peers to leverage existing knowledge. Explore tags, ownership details, links to other sources and other information to shorten and simplify data discovery phase. Forget unnerved stakeholders and wasting too much time on digging the root cause of data issues when it fails. With ODD’s automatic company-wide ingestion-to-product lineage you’ll have answers in just seconds and stakeholders won’t need to wait. Sleep well, knowing all your data is in check. Forget manual testing, days of debugging, and weeks of worrying. Know the impact of each code change with automatic testing. Enjoy lineage and alerts powered with data quality information. -
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OSHI
Native Operating System and Hardware Information
OSHI is a free JNA-based (native) Operating System and Hardware Information library for Java. It does not require the installation of any additional native libraries and aims to provide a cross-platform implementation to retrieve system information, such as OS version, processes, memory and CPU usage, disks and partitions, devices, sensors, etc. -
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ObjectBox Java Database
Java and Android Database - fast and lightweight without any ORM
High-performance NoSQL database with integrated Data Sync for decentralized Edge Computing. Get fast access to the data you need across Embedded Devices, IoT, and Mobile. ObjectBox is 10x faster than any alternative, with high-speed data ingestion that increases response times. Check out our benchmarks. ObjectBox’ out-of-the-box synchronization makes data available when needed where needed, eliminating data islands and improving data flow. Develop applications that work on- and offline, independently from a constant Internet connection, providing an “always-on”-feeling. Accelerate time-to-market with ObjectBox’ easy and super fast native language APIs, that bring the fun back to coding. ObjectBox reduces mobile network and cloud costs more than 40% by persisting data locally (on the edge), and syncing with low overhead and high efficiently. -
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OpenDataLoader PDF
PDF Parser for AI-ready data. Automate PDF accessibility
OpenDataLoader PDF is an open-source document processing system designed to convert complex PDF files into structured, AI-ready formats such as Markdown, JSON, and HTML while preserving layout, hierarchy, and semantic meaning. It focuses on enabling downstream use cases like retrieval-augmented generation (RAG), knowledge extraction, and document intelligence pipelines by maintaining accurate reading order and spatial metadata through bounding boxes. The tool combines deterministic parsing methods with an optional hybrid AI-powered mode that improves extraction quality for difficult layouts such as multi-column documents, scanned files, and scientific papers. It includes built-in OCR capabilities supporting dozens of languages, making it suitable for digitizing low-quality or image-based PDFs. A key differentiator is its emphasis on accessibility automation, as it can generate tagged PDFs aligned with accessibility standards, significantly reducing manual remediation effort. -
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Opik
Debug, evaluate, and monitor your LLMapps, RAG systems, and agentic AI
Confidently evaluate, test, and monitor LLM applications. Opik is an open-source platform for evaluating, testing, and monitoring LLM applications. Built by Comet. Record, sort, search, and understand each step your LLM app takes to generate a response. Manually annotate, view, and compare LLM responses in a user-friendly table. Log traces during development and in production. Run experiments with different prompts and evaluate against a test set. Choose and run pre-configured evaluation metrics or define your own with our convenient SDK library. Consult built-in LLM judges for complex issues like hallucination detection, factuality, and moderation.
