Free and Open Source, Distributed, RESTful Search Engine

Zipkin is a distributed tracing system

Apache Pulsar - distributed pub-sub messaging system

Apache Druid: a high performance real-time analytics database.

Apache Pinot - A realtime distributed OLAP datastore

Web UI for PrestoDB.

Mass Service Engine in Cluster(MSEC) is opened source by QQ team from Tencent. It is a backend DEV &OPS engine, including RPC,name finding,load balance,monitoring,release and capacity management.

Apache Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log-like data

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