twitter/finagle

The java implementation of Apache Dubbo. An RPC and microservice framework.

C++ based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)

Apache Thrift

A platform to build and run apps that are elastic, agile, and resilient. SDK, libraries, and hosted environments.

brpc is an Industrial-grade RPC framework using C++ Language, which is often used in high performance system such as Search, Storage, Machine learning, Advertisement, Recommendation etc. "brpc" means "better RPC".

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.

Resilience4j is a fault tolerance library designed for Java8 and functional programming

Netty project - an event-driven asynchronous network application framework

Feign makes writing java http clients easier