Like most of the people on here, I have plenty of samples on my website (http://www.eonclash.com/) including spriting using only GDI and transparent input. Even have an example game engine based around FreePascal, Lua, and SDL.

You will have a problem trying to find sound libraries that are cross platform that don't require a DLL, SO, LIB, or other module (dependent on platform).

- Jeremy