Java

C-OCR是携程自研的OCR项目，主要包括身份证、护照、火车票、签证等旅游相关证件、材料的识别。 项目包含4个部分，拒识、检测、识别、后处理。

📱Tinder like swipeable card view for Android

BitTorrent library and client with DHT, magnet links, encryption and more

A material style progress wheel compatible with 2.3

Confluent Schema Registry for Kafka

Reitti is a comprehensive personal location tracking and analysis application that helps you understand your movement patterns and significant places. The name "Reitti" comes from Finnish, meaning "route" or "path".

A p2p, secure file storage, social network and application protocol

Java MQTT lightweight broker

JeroMQ is a pure Java implementation of the ZeroMQ messaging library, offering high-performance asynchronous messaging for distributed or concurrent applications.

RxJava types that are both an Observable and a Consumer.

Apache ActiveMQ

[deprecated] Animations for Android L drawer, back, dismiss and check icons

OpenTelemetry Java SDK

Base Admin一套简单通用的后台管理系统，主要功能有：权限管理、菜单管理、用户管理，系统设置、实时日志，实时监控，API加密，以及登录用户修改密码、配置个性菜单等

A simple RPC framework based on Netty, ZooKeeper and Spring

The SpotBugs plugin for security audits of Java web applications and Android applications. (Also work with Kotlin, Groovy and Scala projects)

雪球股票信息超级爬虫

🐎基于SpringCloud 2025.x + Dubbo 3.x + AI构建的模拟秒杀微服务项目，集成了Elasticsearch🔍、Gateway、Mybatis-Plus、Sharding-JDBC等常用开源组件

Java language server

A flow layout for Android with auto-spacing.

:heavy_check_mark: A framework that helps the keyboard smoothly transition to the function panel 一个帮助键盘平稳过渡到功能面板的框架，支持动画无缝衔接，支持 activity/fragment/dialog/dialogFragment/popupWindow 容器，支持IM/直播/视频播放/信息流评论等场景，支持全屏模式。

CRAP - 开源API接口管理平台 | 完全开源、免费使用的API接口管理系统、BUG管理系统：API接口管理、文档管理、数据库表管理、接口调试、浏览器调试插件、导出word&pdf接口…..，采用SpringMVC + MyBatis + Lucene + Bootstrap + Angularjs + Iconfont + Guava Cache ，线上使用地址：http://api.crap.cn

A modular and portable open source XMPP client library written in Java for Android and Java (SE) VMs

Apache Fineract

We do Open Source ERP - Fast, Flexible & Free Software to scale your Business.

🚀A lightweight, high availability Android version update framework.(一个轻量级、高可用性的Android版本更新框架)

Java distributed tracing implementation compatible with Zipkin backend services.

A library that makes working with Bluetooth LE on Android a pleasure. Seriously.

Hacker's Keyboard (official)

Purpur is a drop-in replacement for Paper servers designed for configurability, and new fun and exciting gameplay features.