FRRouting is described as '(FRR) is a free software IP routing protocol suite for Linux and Unix platforms which' and is an app in the Office & Productivity category. There are 2 alternatives to FRRouting for Linux and BSD. The best alternative is BIRD, which is both free and Open Source.
BIRD is an open source implementation of a TCP/IP routing daemon for Unix like systems. It supports both IPv4 and IPv6, multiple routing tables, and a BGP, RIP and OSPF routing protocols, as well as statically defined routes.
Quagga is a network routing software suite providing implementations of Open Shortest Path First (OSPF), Routing Information Protocol (RIP), Border Gateway Protocol (BGP) and IS-IS for Unix-like platforms, particularly Linux, Solaris, FreeBSD and NetBSD.