NetBox
NetBox is a free web application that documents a network’s IP addresses, racks, devices and cables, built for network teams and run on a Linux server.
Linux · Web Open source
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NetBox
FRRouting
FRRouting is a free routing suite (BGP, OSPF, IS-IS, PIM and more) for Linux and BSD, aimed at network engineers, hosting providers and data centres.
Linux Open source
EVE-NG
Multi-vendor network emulation platform you install on a server or VM and control from a web browser, with a free tier for learning.
Windows · macOS · Linux Free with in-app purchases
GNS3
Free, open source network emulator that runs real virtual routers and firewalls on a PC to build and test networks, on Windows, macOS and Linux.
Windows · macOS · Linux Open source