Quagga

Quagga is a routing software suite, providing implementations of: for Unix platforms, particularly FreeBSD, Linux, Solaris and NetBSD.
 * OSPFv2
 * OSPFv3
 * RIP v1 and v2
 * RIPng
 * BGP-4

Telnet
You can use telnet to connect to and configure the running daemons.