ganglia-activemq monitors ActiveMQ queue sizes with Ganglia.
statsd-c is a reimplementation of Etsy's famous/infamous "statsd" in C.
statsd-go is a reimplementation of statsd in Go (forked from gographite) with Ganglia submission support.
An SMS gateway to XMPP daemon
A .NET assembly, COM component, and Ruby extension for finite element results post-processing.