- [Statsd](https://github.com/etsy/statsd/) - Daemon that listens for statistics like counters and timers, sent over UDP or TCP, and sends aggregates to one or more pluggable backend services. `MIT``Nodejs`
- [tcollector](http://opentsdb.net/docs/build/html/user_guide/utilities/tcollector.html) - Gathers data from local collectors and pushes the data to OpenTSDB. ([Source Code](https://github.com/OpenTSDB/tcollector/)) `LGPL-3.0/GPL-3.0``Python`
- [Telegraf](https://github.com/influxdata/telegraf) - Plugin-driven server agent for collecting, processing, aggregating, and writing metrics. `MIT``Go`
- [CloudRay Agent](https://github.com/cloudray-io/cloudray-agent) - Lightweight agent to monitor and automate your Linux and macOS machine enabling secure, Bash scriptable infrastructure management without requiring SSH. `MIT``Rust`