RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

CAT 作为服务端项目基础组件，提供了 Java, C/C++, Node.js, Python, Go 等多语言客户端，已经在美团点评的基础架构中间件框架（MVC框架，RPC框架，数据库框架，缓存框架等，消息队列，配置系统等）深度集成，为美团点评各业务线提供系统丰富的性能指标、健康状况、实时告警等。

High Performance Inter-Thread Messaging Library

Zipkin is a distributed tracing system

The Java gRPC implementation. HTTP/2 based RPC

Virtual Engine for Android(Support 14.0 in business version)

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.

A distributed in-memory data store for the cloud

Dynamic Code Evolution VM for Java 7/8

jsprit is a java based, open source toolkit for solving rich vehicle routing problems

Hollow is a java library and toolset for disseminating in-memory datasets from a single producer to many consumers for high performance read-only access.

Java Evaluator API for PMML

The on premise, open source version of Eventuate, which is a platform for developing transactional business applications that use the microservice architecture.

Flowmix is a flexible event processing engine for Apache Storm. It supports complex correlations of events via sliding/tumbling windows. It allows parallel streams to be processed that can be group…