The AmigaDOS, previously written in BCPL and very difficult to develop for beyond basic file manipulation, was mostly rewritten in C.
Concurrent Versions System | International versions of Wheel of Fortune | This Time I Know It's for Real#Cover versions | Non-English versions of The Simpsons | My Versions | Don't Dream It's Over#Cover versions | Coptic versions of the Bible | Brewster's Millions#Movie versions |