I have not seen, nor tried very hard to find, a list that cross references creatures in all the add books by types. For example, all the insect or insect like creatures in MM, MM2, FF, OA, etc.

That is something I have worked on because if you have dinosaur island, you want all the dinos from all the books.

If you want an all insect dungeon with ants and thri-keen.

Slimes, molds, fungus, undead, etc.

My working lists have which book and page and hit dice. This way, I can develop areas, dungeons, and encounter tables that are level specific.

This type of index beats having to look through all the books trying to find what you want.