SDL for AmigaOS 4.0 project is a port of SDL, the Simple Directmedia Layer, for AmigaOS 4.0 SDL is a popular open-source API for games and other software that need low-level access to video and audio hardware and input devices.
SDL was created and is maintained by Sam Lantinga, but has had a legion of contributors of the years (see SDL credits). The AmigaOS 4.0 port was created originally by Thomas and Hans Joerg Frieden, but for the last two years has largely been the work of me, Richard Drummond.
Other contributors include Juergen Schober (who developed the audio layer). You can find may OS4.0 applications built with SDL at os4depot.net and some that I have built on my Amiga Stuff page.