Here are a few C++/SDL source codes you can port over!
http://www.sourcecodesworld.com/sour...y.asp?CatId=45
http://www.doomworld.com/classicdoom/ports/
http://www.identicalsoftware.com/btbuilder/
http://www.identicalsoftware.com/ogs/
Edit: Whoops I posted this in the wrong forum, mabye someone could move it!