There are many. I'll start a list hope others contribute.
- Book of Enoch
- Book of Jasher
- Gospel of Thomas
- Del and the Dragon
- Sussanna and the Elders
- Book of Judith
- first and second Maccabees
Actually there aren't any books missing. See if God wanted the Bible with what is in it now, that is what he will have. If he wanted these other books, the Bible would have them, but it doesn't. If God wants something, he will have it. So, like Jonah had ran away from were god was leading him, God, in a way, pointed him back in the right direction with the whale.