rrd-fixpeaks removes errant "peaks" in RRD data. It requires rrdtool.
rrd-merge merges RRD (round robin database) files together, including the files used by Ganglia, Cacti, and other rrdtool-based software.
statsd-go is a reimplementation of statsd in Go (forked from gographite) with Ganglia submission support.
A generator of all major barcode formats entirely within Postscript.
A network protocol analyzer for Mac OS X.