brpc #Project#: Most common RPC framework used throughout Baidu, with 600,000+ instances and 500+ kinds of services, called "baidu-rpc" inside Baidu.
gRPC #Project#: gRPC is a modern, open source, high-performance remote procedure call (RPC) framework that can run anywhere. It enables client and server applications to communicate transparently, and makes it easier to build connected systems.
rpcx #Project#: Faster multil-language bidirectional RPC framework in Go, like alibaba Dubbo and weibo Motan in Java, but with more features, Scale easily.
Dubbo #Project#: Apache Dubbo (incubating) is a high-performance, java based, open source RPC framework.
OCTO #Project#: 微服务通信框架及治理平台 OCTO 作为美团基础架构设施的重要组成部分，目前已广泛应用于公司技术线，稳定承载上万应用、日均支撑千亿级的调用。
2018-Tars #Project#: Tars is a high-performance RPC framework based on name service and Tars protocol, also integrated administration platform, and implemented hosting-service via flexible schedule.
gron #Project#: gron transforms JSON into discrete assignments to make it easier to grep for what you want and see the absolute 'path' to it.
Distributed Tracing | 分布式追踪
Zipkin #Project#: Zipkin is a distributed tracing system. It helps gather timing data needed to troubleshoot latency problems in microservice architectures. It manages both the collection and lookup of this data. Zipkin’s design is based on the Google Dapper paper.
Pinpoint #Project#: Pinpoint is an APM (Application Performance Management) tool for large-scale distributed systems written in Java / PHP.