mlan is the Makers Local Area Network (or the Mini-LAN?), right now just an idea for a lightweight, portable game LAN to deploy at parties.
"Works on pretty old hardware." means that the game runs well on ctag's X200 laptop.
Executable. Works on pretty old hardware.
Native support. Works on pretty old hardware.
Uses mono, but runs very well on old hardware. Has an archlinux package and dedicated server executable.
Team Fortress 2
Probably won't work on our target hardware. Untested.
Age of Empires
unlikely, it's a heavy program running on wine. Does not run on pretty old hardware.
Don't Starve Together
ehh, requires an internet connection IIRC. Doesn't run well on pretty old hardware.