Codex Martialis is a giant pack of weapon goodness.

The one downside: Not much that isn't easily available. However, since it's all statted out, this can be forgiven, since I've never seen such a large collection of weapons all statted out for the same rules, and most medieval weaponry is pretty easy to find, but not easy to actually know much about other than general function.

All in all, it's good, has lots of diagrams, and all that jazz. However, it just feels like it's missing something, so I feel that I can't give it a five. If you need a ton of weapons quick, this may be your best bet.