Quagga is described as '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' and is an app in the network & admin category. There are nine alternatives to Quagga for a variety of platforms, including Linux, Self-Hosted, Windows, GNS3 and VMware Workstation Player apps. The best Quagga alternative is MikroTik RouterOS. It's not free, so if you're looking for a free alternative, you could try BIRD or FRRouting. Other great apps like Quagga are VyOS, Junos OS, Cisco IOS and FreeRouter.