I remember Matt Dillon's DICE C compiler for the Amiga. It was only a trial version so only stdlib stuff. I wrote a little HTML viewer in it which used ANSI codes to display bold text, italic, underline etc.
I wonder what type of computing world we would be in if OSS were more prominent back in the late 80's / early 90's. Imagine what we could have built with an open source compiler (GCC) and a bunch of example code (Github) for the Amiga. Wow! :)