Tds — Uncopylocked ((top))

If a game is — that is, the developer manually disables the copy lock in the game's settings — then anyone can open a copy of that exact game in Studio, edit the maps, change the code, and publish it as their own.

[TDS] Uncopylocked - Free Model Edition

Since you cannot download the actual TDS source code, developers often turn to these community-vetted resources: tds uncopylocked