collectd

A daemon that collects system performance statistics periodically, and provides tons of plugins to store and analyze these values

     

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Consul

Consul makes it simple for services to register themselves and to discover other services via a DNS or HTTP interface. Register external services such as SaaS providers as well

     

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Instrumental

Instrumental is a real-time, high-scale application and server monitoring tool with intelligent alerts, a powerful query language, and free development accounts.

     

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Nomad

Nomad is a lightweight workload orchestrator. It offers client instance scaling as well as workload scaling.

     

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Rex

A agent-less server orchestration tool built on Perl

     

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Serf

Serf is a service discovery and orchestration tool which is highly decentralized, highly available, fault tolerant, cross platform and extremely lightweight.

     

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Zabbix

An open source, enterprise-class monitoring framework

     

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