Since you're specifically asking for examples on non-OO code, and another commenter made mention of Haskell code: try xmonad. Here's a link to get started on s

Since you're specifically asking for examples on non-OO code, and another commenter made mention of Haskell code: try xmonad. Here's a link to get started on studying xmonad's code: http://www.haskell.org/haskellwiki/Xmonad/Guided_tour_of_the_xmonad_source http://www.haskell.org/haskellwiki/Xmonad/Guided_tour_of_the... Incidentally, it's like only 1000 lines of code, so it's super efficient and super optimized.