patch-room
Patch panels, racks and power feeds: the layers a diagram usually leaves out.
Drawn at physical · l1 · rack · power from examples/patch-room by netviz -i examples/patch-room render -f html. Open it on its own — it is one file, and it works offline.
Pick a layer from the switcher inside the diagram; hover or focus a node for its interfaces, addresses, VLANs and cabling; filter by VLAN or namespace. All the examples · Build one of your own.