OpenBGPD/OpenBSD: Free OpenBSD-based EGP/IGP routing platform. Solid, secure, free, and very scalable. Again, you're operating without vendor support. Non-standard of BGP functionality (modeled after PF). Awesome integration with CARP and PF, makes for great firewalls, routers and route servers. If you are system administrator and appreciate Unix, you will fall in love with OpenBGPD. If you are a Linux admin, you will be surprised at the lack of learning curve involved. Community support is actually pretty good.
http://www.isp-planet.com/equipment/2007/routers_bol.html
