Future Communications Software also makes protocol stacks for embedded systems, including the FutureBGP BGP implementation.

Wind River has a RouterWare product line with protocol stacks for embedded systems. One of their products is a BGP stack.

Alcatel's 7420 ESR seems to have some telco heritage, but it is an IP router.

Nortel Networks uses a distributed system design in their Backbone Node Concentrator routers.

Charlotte's Networks has a huge "Terabit Router", the Aranea-1.

Entrasys Networks also builds multilayer (up to layer 4) switches that support BGP.

Riverstone Networks has a series of Metro Routers.

Extreme Networks also builds Ethernet switches with BGP capability and support for SONET and ATM: the Summit i, BlackDiamond and Alpine models.

Foundry Networks' BigIron and NetIron and possibly FastIron switches handle BGP. Apart from the Ethernet family, these switches also do Packet over SONET and ATM.

Juniper Networks has a number of routers built around a special packet forwarding ASIC: M5, M10, M20, M40 and M160. Newer additions to the family are the M7i (the "Cisco 7200 killer"), M10i and the M320.

Cisco Systems has an extensive line of routers that run Cisco's IOS software. The 2500 and higher models support BGP, although the 2500 series itself is not powerfull enough to handle anything near the full routing table. There are now also several multilayer switches such as the 6500 that can route IP and run BGP.

The Multi-Threaded Routing Toolkit (MRT or MRTD) routing software by the University of Michigan and Merit Network runs on many systems (including Windows2000/NT, it seems). Development status is unclear.

The GateD routing software is available as a commercial product from NextHop Technologies. There used to be a free version as well. Maybe it's still around somewhere.

IP Infusion offers the ZebOS Advanced Routing Suite, which is a commercial off-shoot of GNU Zebra. It has many enhancements, including MPLS VPNs using BGP and it runs on Linux, Solaris, any BSD and several other operating systems.

GNU Zebra is free routing software distributed under the GNU Public License, developed by Kunihiro Ishiguro, that runs on Linux and many BSD platforms. Zebra fully supports IPv6. The user interface is very Cisco-like. Current versions are pre-releases for the first official release.