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#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

Free and Open Source, Distributed, RESTful Search Engine

LeetCode Solutions: A Record of My Problem Solving Journey.( leetcode题解，记录自己的leetcode解题之路。)

Free universal database tool and SQL client

Apache Spark - A unified analytics engine for large-scale data processing

Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

A browser automation framework and ecosystem.

Conductor is an event driven agentic workflow engine providing durable and highly resilient execution engine for applications and AI Agents

The automation tower defense RTS

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Apache Flink

Jenkins automation server

Open-source data movement for ELT pipelines and AI agents — from APIs, databases & files to warehouses, lakes, and AI applications. Both self-hosted and Cloud.

Adaptable, fast automation for all

QuestDB is a high performance, open-source, time-series database

Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.

Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...

🍃 Organic Maps is a free Android & iOS offline maps app for more than 6M travelers, tourists, hikers, and cyclists. It uses crowd-sourced OpenStreetMap data and is developed with love by the community. No ads, no tracking, no data collection, no crapware. Please donate to support the development!

Docker image that provides a Minecraft Server for Java Edition that automatically installs/upgrades versions, modloaders, modpacks and more at startup

🔎 Open source distributed and RESTful search engine.

Apache ZooKeeper

LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot.

OpenRefine is a free, open source power tool for working with messy data and improving it

Loop Habit Tracker, a mobile app for creating and maintaining long-term positive habits

An Application Framework for AI Engineering

Apache Beam is a unified programming model for Batch and Streaming data processing.

A damn simple library for building production-ready RESTful web services.

A polyglot document intelligence framework with a Rust core. Extract text, metadata, images, and structured information from PDFs, Office documents, images, and 97+ formats. Available for Rust, Python, Ruby, Java, Go, PHP, Elixir, C#, R, C, TypeScript (Node/Bun/Wasm/Deno)- or use via CLI, REST API, or MCP server.

Powerfull download accelerator and video downloader