Open-source repositories gaining traction right now.
57 repositories
#java
Lightning-Fast, On-Device, Multilingual TTS — running natively via ONNX.

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

Model-rocketry aerodynamics and trajectory simulation software

This open-source curriculum introduces the fundamentals of Model Context Protocol (MCP) through real-world, cross-language examples in .NET, Java, TypeScript, JavaScript, Rust and Python. Designed for developers, it focuses on practical techniques for building modular, scalable, and secure AI workflows from session setup to service orchestration.

Open-source, ad-free Android multimedia recorder with background video recording, screen recording, live streaming, and remote camera control

Google core libraries for Java

Free and Open Source, Distributed, RESTful Search Engine

Star kdn251 / interviews Everything you need to know to get the job.

Apache Maven core

Agent framework for the JVM. Pronounced Em-BAY-bel /ɛmˈbeɪbəl/

Jenkins automation server

Star spring-projects / spring-boot Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.

Star dbeaver / dbeaver Free universal database tool and SQL client

Open source transactional distributed database. Linear scalability and proven fault-tolerance on commodity hardware or cloud infrastructure without compromising performance.

Star openjdk / jdk JDK main-line development https://openjdk.org/projects/jdk

Star trinodb / trino Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

Star conductor-oss / conductor Conductor is an event driven agentic orchestration platform providing durable and highly resilient execution engine for applications and AI Agents

Star openrewrite / rewrite Automated mass refactoring of source code.

Star checkstyle / checkstyle Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.

Star apache / nifi Apache NiFi

Star apache / lucene Apache Lucene open-source search software

Star antlr / antlr4 ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Star prestodb / presto The official home of the Presto distributed SQL query engine for big data

Star aws / aws-sdk-java-v2 The official AWS SDK for Java - Version 2

Star apache / camel Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.

Star spring-projects / spring-batch Spring Batch is a framework for writing batch applications using Java and Spring

Star TheAlgorithms / Java All Algorithms implemented in Java

Sponsor Star SeleniumHQ / selenium A browser automation framework and ecosystem.

Star apache / kafka Mirror of Apache Kafka

Star yuliskov / SmartTube Browse media content with your own rules on Android TV

Star Anuken / Mindustry The automation tower defense RTS

Star kestra-io / kestra Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Sponsor Star kunal-kushwaha / DSA-Bootcamp-Java This repository consists of the code samples, assignments, and notes for the Java data structures & algorithms + interview preparation bootcamp of WeMakeDevs.

Star microg / GmsCore Free implementation of Play Services

Star opensearch-project / OpenSearch 🔎 Open source distributed and RESTful search engine.

Sponsor Star plantuml / plantuml Generate diagrams from textual description

Sponsor Star PaperMC / Paper The most widely used, high performance Minecraft server that aims to fix gameplay and mechanics inconsistencies

Star cabaletta / baritone google maps for block game

Star apache / beam Apache Beam is a unified programming model for Batch and Streaming data processing.

Star apache / tomcat Apache Tomcat

Sponsor Star AsamK / signal-cli signal-cli provides an unofficial commandline, JSON-RPC and dbus interface for the Signal messenger.

Star camunda / camunda Process Orchestration Framework

Star Sketchware-Pro / Sketchware-Pro Sketchware Pro's sources in Java. Now anyone can contribute to Sketchware Pro.

“接入大模型的AI-agent 互联网后端面试助手,支持在线 ACM模式IDE 与多平台面经整合,支持定制化个人面经库(RAG)与简历/面试复盘”

Kaleido AI智能衣柜是基于微服务架构的AI智能衣柜,项目使用JDK21、SpringBoot 3.5、SpringCloud 2025、SpringAI 1.1进行开发,基于DDD + CQRS + 整洁架构,为用户提供衣物管理、个性化穿搭方案和智能推荐服务。

Modern support ticket solution

Cycle Based - Java Gameboy Emualtor

A high-performance HTTP sink connector for Apache Flink DataStream API — async, batched, with retries and AIMD rate limiting.

OCI OpenAI Client for Java simplifies integration between OpenAI’s Java SDK and Oracle Cloud Infrastructure (OCI) GenAI service by providing robust authentication and authorization utilities.

Enterprise-grade Hospital Management System built using Java 11, Jakarta Servlet 6, JSP, JDBC, and MySQL. Implements layered MVC architecture with DAO pattern, role-based authentication, appointment scheduling, medical reports management, and audit logging.

Small CBOR Encoder / Decoder for Java

The objective of the PalindromeChecker App is to design and implement a console-based Java application that validates whether a given string is a palindrome under different conditions, while strengthening core programming fundamentals and data structure concepts.

A high-performance, strictly-typed REST API built with Java 17 and Spring Boot 3 Designed to manage personal finances ..

Secure authentication plugin for Paper/Spigot 1.21.x.

Java Domain Factory Tactical Pattern


experimental lang that compiles to Java
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