Gooseman's weird F2P Counter-Strike 2-ish thing. Malformed and screwed from the start, but I can't help but feel a strange attachment to it.
You'll need to mount the TI content in Source Filmmaker for this to work. It's free, so no problem there, but you'll need to do a bit of mucking around to extract the resources. Please read the README.
Current Contents: Uprising, Airport, Castalla, Construction, Highway, Innercity, Mall, Monaco, Morning Calm, Skyrise, Uprising, TDM1, TDM2, TDM3, TDM5.