Saints Row 2 [Steam Link] is currently free to grab it on Steam for a limit time, so act quick if you don't own it yet. The other Saints Row titles are on sale as well.
While I wasn't very impressed with the port personally, some of you who don't own it might want to check it out. If you add it to your accounts now, it should be free to own forever. Always nice when developers offer this for some of their older games, but it's just clever marketing for their newer games.
You can find them all here and on Steam they all support Linux, sadly GOG isn't stocking the Linux versions.
If you are trying it for the first time, come back and tell us how it runs for you!