Flapjack vs Statsite: What are the differences?
Developers describe Flapjack as "Monitoring notification routing + event processing system". Flapjack is a flexible monitoring notification routing system that handles: alert routing, alert summarisation, your standard operational tasks. On the other hand, Statsite is detailed as "C implementation of statsd". Statsite is a metrics aggregation server. Statsite is based heavily on Etsy's StatsD https://github.com/etsy/statsd, and is wire compatible.
Flapjack and Statsite can be categorized as "Monitoring" tools.
Flapjack and Statsite are both open source tools. Statsite with 1.73K GitHub stars and 241 forks on GitHub appears to be more popular than Flapjack with 656 GitHub stars and 91 GitHub forks.