These two guys wrote the first TS3 Story Progression mod, the one that Twallan later took over and continued developing. Very nice guys, great community members, smart and innovative. Well, I just ran across this:

http://theindiestone.com/community/viewforum.php?f=19

They have apparently written their own zombie sim! I am not a big zombie person myself but I think I am going to have to try it, just to support those two.

Oh! I saw this somewhere else. I had no idea they made it..

Well, now I have to play it.