EnableConsole

toggle via Shift+~. doesn't have much of interest besides the hosting commands, which are useful if you're a modder looking to test multiplayer functionality.

has 4 commands built in:

• build_id: prints the game's build id, branch, and version number.
• toggle_hud: self-explanatory.
• iphost (port): start a non-steam coop game on the given port number. avoid numbers below 1024 and above 65535.
• ipconnect (ip) (port): connect to a coop game hosted with iphost on the matching port number. (ip) can also be a hostname instead, use localhost or 127.0.0.1 to connect to a game running on the same computer.