Projects

• Messaging

  • Emissary - Simple, lightweight, yet FAST messaging library for decoupling messages (requests and events) and message handlers.

• Microservice

  • ActiveRPC - Lightweight and fast library for complex high-load distributed applications and Memcached-like solutions.
  • Nacos - Dynamic service discovery, configuration and service management platform for building cloud native applications.
  • Quarkus - Kubernetes stack tailored for the HotSpot and Graal VM.
  • Armeria - Asynchronous RPC/REST client/server library built on top of Java 8, Netty, HTTP/2, Thrift and gRPC.
  • consul-api - Client for the Consul API: a distributed, highly available and datacenter-aware registry/discovery service.
  • Eureka - REST-based service registry for resilient load balancing and failover.
  • JDA - Wrapping of the Discord REST API and its WebSocket events.
  • kubernetes-client - Client provides access to the full Kubernetes & OpenShift REST APIs via a fluent DSL.
  • OpenAI-Java - Java libraries for using OpenAI's GPT-3 API.
  • Sentinel - Flow control component enabling reliability, resilience and monitoring for microservices.
  • KeenType - Modernized version of a Java-based implementation of the New Typesetting System, which was heavily based on Donald E. Knuth's original TeX.

• Miscellaneous

  • JBake - Static website generator.
  • JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
  • JObfuscator![c - Source code obfuscator.
  • Joda-Money - Basic currency and money classes and algorithms not provided by the JDK.
  • JPad - Snippet runner.
  • OpenRefine - Tool for working with messy data: cleaning, transforming, extending it with web services and linking it to databases.
  • Svix - Library for the Svix API to send webhooks and verify signatures.
  • Togglz - Implementation of the Feature Toggles pattern.
  • CQEngine - Ultra-fast, SQL-like queries on Java collections.
  • Design Patterns - Implementation and explanation of the most common design patterns.
  • FF4J - Feature Flags for Java.
  • FizzBuzz Enterprise Edition - No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes. (No explicit license)
  • IP2Location.io Java SDK - Wrapper for the IP2Location.io Geolocation API and the IP2WHOIS domain WHOIS API.
  • ISBN core - A small library that contains a representation object of ISBN-10 and ISBN-13 and tools to parse, validate and format one.
  • J2ObjC - Java-to-Objective-C translator for porting Android libraries to iOS.
  • JBot - Framework for building chatbots. (GPL-3.0-only)
  • JCuda - JCuda offers Java bindings for CUDA and CUDA-related libraries.
  • JEmoji - An auto-generated emoji library that provides type-safe direct access to emojis and alias support for Discord, Slack, GitHub and many more features.
  • Jimfs - In-memory file system.
  • jOOX - Simple wrapper for the org.w3c.dom package, to allow for fluent XML document creation and manipulation with an API inspired by jQuery.
  • jsweet - Source transpiler to TypeScript/JavaScript.
  • Maven Wrapper - Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.
  • MinimalFTP - Lightweight, small and customizable FTP server.
  • LittleProxy - High performance HTTP proxy atop Netty's event-based networking library.
  • Modern Java - A Guide to Java 8 - Popular Java 8 guide.
  • Modernizer - Detect uses of legacy Java APIs.
  • OctoLinker - Browser extension which allows to navigate through code on GitHub more efficiently.
  • PipelinR - Small utility library for using handlers and commands with pipelines.
  • Polyglot for Maven - Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.
  • RR4J - RR4J is a tool that records java bytecode execution and later allows developers to replay locally.
  • Simple Java Mail - Mailing with a clean and fluent API.
  • Smooks - Framework for fragment-based message processing. (Apache-2.0 OR LGPL-3.0-or-later)
  • TypeTools - Tools for resolving generic types.
  • webcam-capture - Library for using built-in and external webcams directly in Java.
  • XMLBeam - Processes XML by using annotations or XPath within code.
  • yGuard - Obfuscation via renaming and shrinking.
  • JBang - JBang makes it easy to use Java for scripting. It lets you use a single file for
  • JPad - Snippet runner.
  • Membrane Service Proxy - Open-source, reverse-proxy framework.
  • JBang - JBang makes it easy to use Java for scripting. It lets you use a single file for code and dependency management and allows you to run it directly.
  • Nyagram - Reactive, type-safe framework for Telegram bots based on Spring Boot 3 and Java 21.
  • Rollgate - Cloud-managed feature flag platform with a Java SDK, supporting gradual rollouts, A/B testing, and real-time updates.

• Mobile Development

  • Codename One - Cross-platform solution for writing native mobile apps. (GPL-2.0-only WITH Classpath-exception-2.0)
  • MobileUI - Cross-platform framework for developing mobile apps with native UI in Java and Kotlin.
  • Multi-OS Engine - Open-source, cross-platform engine to develop native mobile (iOS, Android, etc.) apps.

• Monitoring

  • Glowroot - Open-source Java APM.
  • hippo4j - Dynamic and observable thread pool framework.
  • inspectIT - Captures detailed run-time information via hooks that can be changed on the fly. It supports tracing over multiple systems via the OpenTracing API and can correlate the data with end user monitoring.
  • Jolokia - JMX over REST.
  • zipkin - Distributed tracing system which gathers timing data needed to troubleshoot latency problems in microservice architectures.
  • Apitally - Simple, privacy-focused API monitoring, analytics and request logging for Spring Boot apps.
  • Automon - Combines the power of AOP with monitoring and/or logging tools.
  • Datadog ![c - Modern monitoring & analytics.
  • Dropwizard Metrics - Expose metrics via JMX or HTTP and send them to a database.
  • Failsafe Actuator - Out of the box monitoring of Failsafe Circuit Breaker in Spring-Boot environment.
  • HertzBeat - Real-time monitoring system with custom-monitor and agentless.
  • Jaeger client - Jaeger client.
  • JavaMelody - Performance monitoring and profiling.
  • jmxtrans - Connect to multiple JVMs and query them for their attributes via JMX. Its query language is based on JSON, which allows non-Java programmers to access the JVM attributes. Supports different output writes, including Graphite, Ganglia, and StatsD.
  • Micrometer - Vendor-neutral metrics/observability facade for the most popular metrics/observability libraries.
  • Micrometer Tracing - Vendor-neutral distributed tracing facade for the most popular tracer libraries.
  • nudge4j - Remote developer console from the browser for Java 8 via bytecode injection.
  • OpenTelemetry - Instrument, generate, collect, and export telemetry data to help you analyze your software’s performance and behavior.
  • Prometheus - Provides a multi-dimensional data model, DSL, autonomous server nodes and much more.
  • Sentry , an application error tracking and performance analysis platform.
  • SPM ![c - Performance monitor with distributing transaction tracing for JVM apps.
  • Stagemonitor - Open-source performance monitoring and transaction tracing for JVM apps.
  • Sysmon - Lightweight platform monitoring tool for Java VMs.
  • Pinpoint - Open-source APM tool.
  • Boot Usage Spring Boot Starter - Spring Boot Actuator extension providing application startup and runtime metrics including JVM uptime, memory usage, and CPU load.
  • inspectIT - Captures detailed run-time information via hooks that can be changed on the fly. It supports tracing over multiple systems via the OpenTracing API and can correlate the data with end user monitoring.

• Native

  • Aparapi - Converts bytecode to OpenCL which allows execution on GPUs.
  • JavaCPP - Provides efficient and easy access to native C++.
  • JNA - Work with native libraries without writing JNI. Also provides interfaces to common system libraries.
  • JNR - Work with native libraries without writing JNI. Also provides interfaces to common system libraries. Same goals as JNA, but faster, and serves as the basis for the upcoming [Project Panama](http://openjdk.java.net/projects/panama).
  • native-lib-loader - Native library loader for extracting and loading native libraries from Java.

• Natural Language Processing

  • CoreNLP - Provides a set of fundamental tools for tasks like tagging, named entity recognition, and sentiment analysis. (GPL-3.0-or-later)
  • DKPro - Collection of reusable NLP tools for linguistic pre-processing, machine learning, lexical resources, etc.
  • LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.
  • CogCompNLP - Provides common annotators for plain text input. (Research and Academic Use License)
  • Hypherator - Java hyphenation library with iterator-like interface. Can be used out-of-the box - dictionaries for multiple languages are bundled in.
  • LingPipe - Toolkit for tasks ranging from POS tagging to sentiment analysis.

• Networking

  • MINA - Abstract, event-driven async I/O API for network operations over TCP/IP and UDP/IP via Java NIO.
  • Undertow - Web server providing both blocking and non-blocking APIs based on NIO. Used as a network layer in WildFly. (LGPL-2.1-only)
  • Commons-networking - Client for server-sent events (SSE).
  • Comsat - Integrates standard Java web-related APIs with Quasar fibers and actors.
  • Dubbo - High-performance RPC framework.
  • Grizzly - NIO framework. Used as a network layer in Glassfish.
  • gRPC-java - RPC framework based on protobuf and HTTP/2.
  • KryoNet - Provides a clean and simple API for efficient TCP and UDP client/server network communication using NIO and Kryo.
  • Drift - Easy-to-use, annotation-based library for creating Thrift clients and serializable types.
  • ServiceTalk - Framework built on Netty with APIs tailored to specific protocols and support for multiple programming paradigms.
  • sshj - Programmatically use SSH, SCP or SFTP.
  • TLS Channel - Implements a ByteChannel interface over SSLEngine, enabling easy-to-use (socket-like) TLS.
  • urnlib - Represent, parse and encode URNs, as in RFC 2141. (GPL-3.0-only)
  • Fluency - High throughput data ingestion logger to Fluentd and Fluent Bit.

• ORM

  • Apache Cayenne - Provides a clean, static API for data access. Also includes a GUI Modeler for working with database mappings, and DB reverse engineering and generation.
  • Ebean - Provides simple and fast data access.
  • EclipseLink - Supports a number of persistence standards: JPA, JAXB, JCA and SDO.
  • Hibernate - Robust and widely used, with an active community. (LGPL-2.1-only)
  • Doma - Database access framework that verifies and generates source code at compile time using annotation processing as well as native SQL templates called two-way SQL.
  • MyBatis - Couples objects with stored procedures or SQL statements.
  • MyBatis-Plus - A powerful enhanced toolkit of MyBatis for simplifying development.
  • ObjectiveSql - ActiveRecord ORM for rapid development and convention over configuration.
  • Permazen - Language-natural persistence layer.
  • SimpleFlatMapper - Simple database and CSV mapper.
  • mybatis-dynamic - Code-first dynamic ORM for MyBatis with runtime schema modification.

• PaaS

  • AWS Elastic Beanstalk ![c - AWS-based, with support for Tomcat and Jetty.
  • AWS Lambda ![c - Serverless computation.
  • Google Cloud ![c - Google's cloud infrastructure.
  • Microsoft Azure ![c - Microsoft's cloud infrastructure.
  • Microsoft Azure ![c - Microsoft's cloud infrastructure.

• Pathfinding

  • Pathetic - A highly configurable 3D A\* pathfinding library that uses specific optimizations for high performance.

• PDF

  • Apache FOP - Creates PDFs from XSL-FO.
  • Apache PDFBox - Toolbox for creating and manipulating PDFs.
  • Dynamic Jasper - Abstraction layer to JasperReports. (LGPL-3.0-only)
  • Dynamic Jasper - Abstraction layer to JasperReports. (LGPL-3.0-only)
  • Dynamic Jasper - Abstraction layer to JasperReports. (LGPL-3.0-only)
  • DynamicReports - Simplifies JasperReports. (LGPL-3.0-only)
  • flyingsaucer - XML/XHTML and CSS 2.1 renderer. (LGPL-2.1-or-later)
  • JasperReports - Complex reporting engine. (LGPL-3.0-only)
  • Open HTML to PDF - Properly supports modern PDF standards based on flyingsaucer and Apache PDFBox.
  • OpenPDF - Open-source iText fork. (LGPL-3.0-only & MPL-2.0)
  • Tabula - Extracts tables from PDF files.
  • iText ![c - Creates PDF files programmatically.
  • Open HTML to PDF - Properly supports modern PDF standards based on flyingsaucer and Apache PDFBox.

• Performance analysis

  • fastThread ![c - Analyze and visualize thread dumps with a free cloud-based upload interface.
  • JMH - Harness for building, running, and analysing nano/micro/milli/macro benchmarks written in Java and other languages targeting the JVM. (GPL-2.0 only WITH Classpath-exception-2.0)
  • JMH - Harness for building, running, and analysing nano/micro/milli/macro benchmarks written in Java and other languages targeting the JVM. (GPL-2.0 only WITH Classpath-exception-2.0)
  • honest-profiler - Low-overhead, bias-free sampling profiler.
  • jHiccup - Logs and records platform JVM stalls.
  • JITWatch - Analyze the JIT compiler optimisations made by the HotSpot JVM.
  • LatencyUtils - Utilities for latency measurement and reporting.
  • Heap Seance - Memory leak diagnostics that orchestrates jcmd, jmap, jstat, JFR, Eclipse MAT, and async-profiler into a structured investigation workflow with confidence-based verdicts.
  • JVM Hotpath - Java agent for line-level execution frequency analysis to identify algorithmic bottlenecks.

• Platform

  • BCEL - Byte Code Engineering Library - analyze, create, and manipulate Java class files.
  • BeanUtils - Easy-to-use wrappers around the Java reflection and introspection APIs.
  • BeanUtils2 - Redesign of Commons BeanUtils.
  • BSF - Bean Scripting Framework - interface to scripting languages, including JSR-223.
  • ClassScan - Find Class interfaces, methods, fields, and annotations without loading.
  • CLI - Command-line arguments parser.
  • CLI2 - Redesign of Commons CLI.
  • Codec - General encoding/decoding algorithms, e.g. phonetic, base64 or URL.
  • Collections - Extends or augments the Java Collections Framework.
  • Compress - Defines an API for working with tar, zip and bzip2 files.
  • Configuration - Reading of configuration/preferences files in various formats.
  • Convert - Commons-Convert aims to provide a single library dedicated to the task of converting an object of one type to another.
  • CSV - Component for reading and writing comma separated value files.
  • Daemon - Alternative invocation mechanism for unix-daemon-like java code.
  • DBCP - Database connection pooling services.
  • DbUtils - JDBC helper library.
  • Digester - XML-to-Java-object mapping utility.
  • Email - Library for sending e-mail from Java.
  • Exec - API for dealing with external process execution and environment management in Java.
  • FileUpload - File upload capability for your servlets and web applications.
  • Finder - Java library inspired by the UNIX find command.
  • Flatfile - Java library for working with flat data structures.
  • Graph - General purpose graph APIs and algorithms.
  • I18n - Adds the feature of localized message bundles that consist of one or many localized texts that belong together.
  • Id - Id is a component used to generate identifiers.
  • Imaging - Image library.
  • IO - Collection of I/O utilities.
  • Javaflow - Continuation implementation to capture the state of the application.
  • JCI - Java Compiler Interface.
  • JCS - Java Caching System.
  • Jelly - XML based scripting and processing engine.
  • Jexl - Expression language which extends the Expression Language of the JSTL.
  • JNet - JNet allows to use dynamically register url stream handlers through the java.net API.
  • JXPath - Utilities for manipulating Java Beans using the XPath syntax.
  • Lang - Provides extra functionality for classes in java.lang.
  • Logging - Wrapper around a variety of logging API implementations.
  • Monitoring - Monitoring aims to provide a simple but extensible monitoring solution for Java applications.
  • Nabla - Nabla provides automatic differentiation classes that can generate derivative of any function implemented in the Java language.
  • Net - Collection of network utilities and protocol implementations.
  • OpenPGP - Interface to signing and verifying data using OpenPGP.
  • Performance - Small framework for microbenchmark clients, with implementations for Commons DBCP and Pool.
  • Pipeline - Provides a set of pipeline utilities designed around work queues that run in parallel to sequentially process data objects.
  • Pool - Generic object pooling component.
  • RDF - Common implementation of RDF 1.1 that could be implemented by systems on the JVM.
  • RNG - Commons Rng provides implementations of pseudo-random numbers generators.
  • SCXML - Implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.
  • Validator - Framework to define validators and validation rules in an xml file.
  • VFS - Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.
  • Weaver - Provides an easy way to enhance (weave) compiled bytecode.
  • CUBA Platform - High-level framework for developing enterprise applications with a rich web interface, based on Spring, EclipseLink and Vaadin.
  • Spring - Provides many packages for dependency injection, aspect-oriented programming, security, etc.
  • Light-4J - Fast, lightweight and productive microservices framework with built-in [security](https://github.com/networknt/light-oauth2/).
  • Orienteer - Open-source business application platform for rapid configuration/development of CRM, ERP, LMS and other applications.