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I used it to build distributed replication of a SQLite database. Quite good fun.

Just a nitpick here with the qualifications that I'm one of the authors of Serf: Serf doesn't use Raft. Serf is masterless and the distributed messaging protocol used is SWIM (a gossip protocol).

Apologies, thanks for the correction.

InfluxDB too, a time-series database written entirely in Go.

http://influxdb.com

Username "stonith" commenting on a post about Raft? I laughed out loud.

http://en.wikipedia.org/wiki/STONITH