Purpose

Reference code
IPv6, IPsec, and advanced networking
BSD/OS, FreeBSD, NetBSD, and OpenBSD
Provided "AS IS" like BSD
Free and no warranty
Commercial use is OK

Release schedule
SNAP - every Monday
STABLE - every other month
SNAP - (unstable features) + documents
quality assurance by the TAHI Project
RELEASE - once a year
"memorial versions of stable releases"