「Java学习+面试指南」一份涵盖大部分 Java 程序员所需要掌握的核心知识。准备 Java 面试，首选 JavaGuide！

Free and Open Source, Distributed, RESTful Search Engine

Google core libraries for Java

ZXing ("Zebra Crossing") barcode scanning library for Java, Android

A libre lightweight streaming front-end for Android.

an easy-to-use dynamic service discovery, configuration and service management platform for building cloud native applications.

FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.

🔥 Seata is an easy-to-use, high-performance, open source distributed transaction solution.

Telegram for Android source

APM, Application Performance Monitoring System

Jenkins automation server

a fast, scalable, multi-language and extensible build system

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

一款面向泛前端产品研发全生命周期的效率平台。

High Performance Inter-Thread Messaging Library

Zipkin is a distributed tracing system

A simple app to use Xposed without root, unlock the bootloader or modify system image, etc.

Apache Hadoop

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

The ZAP by Checkmarx Core project

Apache Doris is an easy-to-use, high performance and unified analytics database.

Apache ZooKeeper

Your Cheat Sheet For Android Interview - Android Interview Questions and Answers

业内为数不多致力于极致体验的超强全自研跨平台(windows/linux/android/iOS)流媒体内核，通过模块化自由组合，支持实时RTMP推流、RTSP推流、RTMP播放器、RTSP播放器、录像、多路流媒体转发、音视频导播、动态视频合成、音频混音、直播互动、内置轻量级RTSP服务等，比快更快，业界真正靠谱的超低延迟直播SDK(1秒内，低延迟模式下150~300ms)。

Apache Cassandra®

A powerful Android Dynamic Component Framework.

Modifications to the Minecraft base files to assist in compatibility between mods. New Discord: https://discord.minecraftforge.net/

Alluxio, data orchestration for analytics and machine learning in the cloud

Tutorials for using RabbitMQ in various ways

Apache Storm