Fantastic, more of this. I don't know if I'm just missing it or what, but I'd love a GUI thing that showed all the devices on my network maybe even with a graph view.

I'm using an Eero router out of laziness and even it has some features here that I'd like to see more of in polished "home-user" style network tools; especially since it seems as if more are getting into the "homelab"/"selfhosted" thing.

Do you mean something like nmap's network topolgy view? https://nmap.org/book/zenmap-topology.html

Just for visualizing network topology on Linux, there's a lot of tools.

That's impossible to do reliably without using agents, SNMP, or some other kind of communication protocol that you'll have to set up on each device. If you're ok with that, use SNMP. If you want topology, you'll have to have an agent that logs into all your networking gear and parses the configs.