I contributed a lot of code to Caudium back in the early 00's even going to the Pike/Caudium conference in Paderborn, Germany in 2003 (which is quite an expensive proposition for someone from New Zealand).
My biggest open source project at the moment is a Pike library which reads in packets from libpcap and builds a table of active TCP and UDP flows, including all the metadata about the flows (and optionally the payload) with various callbacks so that you can easily build analysis, diagnostic, accounting or logging applications.
