Made a usable CLI, did some touchups, whipped together some docs, and got a license I am more or less happy with.
Currently support for 2 formats:
Kirby Adventure/Super Star levels
Pokemon Gold/Silver graphics
Download here:
http://disch.arc-nova.org/compresch_rel2.zipWhere I'm going next:
Probably some LttP stuff since MathOnNapkins had some decompression code I can study.
GBA BIOS has some decompression routines too -- so those formats are probably common among many GBA games.
Input, comments, etc always welcome. More to come hopefully.