If you have looked at the DS section and also what people are doing now with the 3ds then no. For the GB/GBC as everything is bundled into one file that you can not really break down you approach it like most similar vintage systems -- tile editors, emulators with graphics viewers*, text extraction tools like atlas (which will want you to find the encoding the game uses, plus the pointers for it). A few people have done some basic work on the music formats but it is not even like the GBA (which also packs everything into one file) where there was a reasonably popular format you could have looked at.
Most tile editors should support the GB/GBC encodings, the GB/GBC should not have done anything especially odd as far as text goes so most things there should still work, audio we already covered and the rest will probably want to be dealt with (both in general and as far as asking questions here) on a case by case basis.
*do remember you can also try to force the game to display a certain sprite/image rather than having to get to that point in the game or hope a random event sees you get what you want. This sort of thing arguably falls under cheat making but -- think like in pokemon where you could change encounters.
