KAME IPv6 code

Rock stable, has been available since 1997
IPv6 operational experience in WIDE research community (torture-test)
High coverage of specs
Ultra spec-conformant
Conformance tested by TAHI verification team
Ready for daily use (we actually are using it every day)
Everything is IPv6 ready
Highly integrated
*BSD integration - IPv6 ready from boot floppy!
Heavily documented and publically available source code
Good for learning, testing, and deployment