One of the most influential games of my childhood was Wasteland (1988). As an homage to this classic game, I largely remade the engine in XNA. I posted a long-winded progress video which shows a complete playthrough of Highpool, all boringly narrated by me!
Once inXile announced their intentions to make Wasteland 2 and in doing so re-release the original Wasteland inside the game, I pretty much abandoned the project. But it was a lot of fun! It was written in C# and LUA.