ashishps1 / awesome-system-design-resources

Learn System Design concepts and prepare for interviews using free resources.

krahets / hello-algo

《Hello 算法》：动画图解、一键运行的数据结构与算法教程。支持简中、繁中、English、日本語，提供 Python, Java, C++, C, C#, JS, Go, Swift, Rust, Ruby, Kotlin, TS, Dart 等代码实现

spring-projects / spring-boot

Spring Boot helps you to create Spring-powered, production-grade applications and services with absolute minimum fuss.

kulwantnagi / android-tv-makeover

Debloat an Android TV, replace its home screen with a clean Apple TV style launcher, and add a fast Indian live TV app. Reversible, over Wi-Fi ADB.

BeatsAD / quiet-tv

面向国内电视机的适配与应用升级改造：轻量 Android 电视桌面、应用配置、可恢复精简与机型验证。基于 Gathin23/tv-vibehack。

tshi-dev / UrTV

Arabic home screen and Saudi screensaver for Android TV / Google TV, plus a safe speed-up. Your AI agent sets it all up. واجهة عربية وشاشة توقف سعودية لتلفزيونات أندرويد، يركّبها لك مساعد الذكاء الاصطناعي.

Nobodiiiii / Terraria-in-Minecraft

Brings real Terraria into Minecraft chests. 在我的世界的箱子中玩真实泰拉瑞亚。

modelcontextprotocol / java-sdk

The official Java SDK for Model Context Protocol servers and clients. Maintained in collaboration with Spring AI

iluwatar / java-design-patterns

Design patterns implemented in Java

spring-projects / spring-framework

Spring Framework

conductor-oss / conductor

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

kestra-io / kestra

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Anuken / Mindustry

The automation tower defense RTS

OtterMind / Chat2DB

Chat2DB is a free, cross-platform, local-first database client and SQL workspace for developers, DBAs, analysts, and data teams. Connect to 40+ databases, manage data, edit and run SQL, and use your own AI model to generate, explain, and optimize queries. Available on desktop, web, Docker, and CLI, with MCP support.

dataease / dataease

🔥 人人可用的开源 BI 工具，数据可视化神器。An open-source BI tool alternative to Tableau.

redisson / redisson

Redisson: Valkey & Redis Java Client and Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Spring, Tomcat, Scheduler, JCache API, Hibernate, RPC, local cache..

google / gson

A Java serialization/deserialization library to convert Java Objects into JSON and back

openjdk / jdk

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

CarGuo / GSYVideoPlayer

Video players (IJKplayer, ExoPlayer, MediaPlayer), HTTPS, 16k page size, danmaku (bullet chat) support, external subtitles, support for filters, watermarks, and GIF screenshots, pre-roll and mid-roll ads, multiple simultaneous playback, basic seeking/dragging, volume and brightness adjustment, play-while-cache support

Tencent / tinker

Tinker is a hot-fix solution library for Android, it supports dex, library and resources update without reinstall apk.

questdb / questdb

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

material-components / material-components-android

[MAINTENANCE MODE] Modular and customizable Material Design UI components for Android

apache / doris

Apache Doris is a real-time analytics and hybrid search database for AI agents.

mockito / mockito

Most popular Mocking framework for unit tests written in Java

elastic / logstash

Logstash - transport and process your logs, events, or other data

deeplearning4j / deeplearning4j

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...

langchain4j / langchain4j

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.

Activiti / Activiti

Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.

OpenFeign / feign

Feign makes writing java http clients easier

spring-projects / spring-security

Spring Security

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.

spring-projects / spring-ai

An Application Framework for AI Engineering

iflytek / astron-agent

Enterprise-grade, commercial-friendly agentic workflow platform for building next-generation SuperAgents.

testcontainers / testcontainers-java

Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container.

google / tsunami-security-scanner

Tsunami is a general purpose network security scanner with an extensible plugin system for detecting high severity vulnerabilities with high confidence.

jeecgboot / jimureport

一款真正的 AI 报表诞生了！JimuChatBI —— 首款免费开源对话式智能数据分析产品（Chat2BI）。 一句话生成报表和数据大屏，支持对话式 AI 修改优化；类 Excel 在线报表设计，兼容国产信创数据源。 对着 AI 说句话，报表就出来了——表格、图表、分组汇总自动生成，复杂报表场景轻松应对。想做数据大屏？同样一句话搞定，让数据分析进入 AI 时代。

logisim-evolution / logisim-evolution

Digital logic design tool and simulator

dependency-check / DependencyCheck

OWASP dependency-check is a software composition analysis utility that detects publicly disclosed vulnerabilities in application dependencies.

apache / zeppelin

Web-based notebook that enables data-driven, interactive data analytics and collaborative documents with SQL, Scala and more.

hazelcast / hazelcast

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

micronaut-projects / micronaut-core

Micronaut Application Framework

apache / iotdb

Apache IoTDB

alipay / SoloPi

SoloPi 自动化测试工具

apache / hudi

Upserts, Deletes And Incremental Processing on Big Data.

apache / fesod

Fast. Easy. Done. Processing spreadsheets without worrying about large files causing OOM.

google / google-java-format

Reformats Java source code to comply with Google Java Style.

hneemann / Digital

A digital logic designer and circuit simulator.

agentscope-ai / agentscope-java

Build distributed, production-grade, long-running agents.

jindrapetrik / jpexs-decompiler

JPEXS Free Flash Decompiler (FFDec) is open-source Flash SWF decompiler and editor. Extract and edit ActionScript, images, sounds, shapes, fonts, and other SWF resources.

killbill / killbill

Open-Source Subscription Billing & Payments Platform

TommyLemon / Android-ZBLibrary

🔥 Android MVP 快速开发框架，做国内 「示例最全面」「注释最详细」「使用最简单」「代码最严谨」的 Android 开源 UI 框架。 🔥 An Android MVP Framework with many demos, detailed documents, simple usages and strict codes.

rubenlagus / TelegramBots

Java library to create bots using Telegram Bots API

LFDT-web3j / web3j

Lightweight Java and Android library for integration with Ethereum clients

grobidOrg / grobid

A machine learning software for extracting information from scholarly documents

jankotek / mapdb

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

orientechnologies / orientdb

OrientDB is the most versatile DBMS supporting Graph, Document, Reactive, Full-Text and Geospatial models in one Multi-Model product. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing and Reactive Queries.

mock-server / mockserver-monorepo

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.

spring-cloud / spring-cloud-netflix

Integration with Netflix OSS components

ant-media / Ant-Media-Server

Ant Media Server — Ultra-low latency streaming engine with WebRTC (~0.5s), SRT, RTMP, HLS, CMAF, adaptive bitrate, transcoding & scaling

apache / fory

A blazingly fast multi-language serialization framework for idiomatic domain objects, schema IDL, and cross-language data exchange.