Discover the most starred and trending open source tools tagged with #java.
MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1, HTTP/2, gRPC, WebSockets, TCP and more on a single port, with additional support for HTTP/3, message brokers, and AI/LLM APIs.
Integration with Netflix OSS components
A self-hosted library for your ebooks, comics, and audiobooks
:date: Easy!Appointments - Self Hosted Appointment Scheduler
Graphviz in your browser
Supercharged End 2 End Testing Framework for NodeJS
Gradle plugin for creating fat/uber JARs, transforming files, relocating packages, and optimizing with R8/ProGuard. The Gradle counterpart to Maven Shade Plugin.
Tiny fast HTML5 game engine with many features and no dependencies.
A build system and monorepo management tool for the web ecosystem, written in Rust.
The Apache Tika toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF).
🔮 An easy-to-use JavaScript unit testing framework.
Java libraries for writing microservices
OpenAPI based HTTP Client code generator
Portable AI agent runtime for the JVM. One @Agent class runs on Spring AI, LangChain4j, Anthropic, or 9 more behind one SPI. Token streaming, tool calls, human approvals, and governance over WebSocket, SSE, gRPC, or WebTransport/HTTP3. Speaks MCP, A2A, and AG-UI.
:clock8: The original jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").
High performance non-blocking webserver
A fast, lightweight and more productive microservices framework
VTable is not just a high-performance multidimensional data analysis table, but also a grid artist that creates art between rows and columns.
Framework for Evolutionary Message-Driven Microservices on the JVM