Quagga is the successor to zebra-pj and to GNU Zebra. Please see https://salt.bountysource.com/teams/quagga for an additional means to advance Quagga development. I have accumulated resources for reunifying Quagga which are available at https://launchpad.net/~jonathan-ferguson. Further information is available at https://www.nongnu.org/quagga/.
Quagga is free software that manages various IPv4 and IPv6 routing
protocols.
Currently Quagga supports the following protocols
Unicast Routing:BGP4, BGP4+, OSPFv2, OSPFv3, RIPv1,
RIPv2, and RIPng as well as very early support for IS-IS.
Multicast Routing: PIM-SSM
See the file INSTALL.quagga.txt for building and installation instructions.
See the file REPORTING-BUGS to report bugs.
Quagga is free software. See the file COPYING for copying conditions.