Monolith have released the editing tools for their first person shooter, Aliens versus Predator 2! :D

What's included in this package:

DEdit, the AvP2 world editor (also contains texture and sprite utilities).
ModelEdit, the AvP2 model editor.
LithRez, a command-line program for packing and unpacking AvP2.REZ (Resource) files.
Softimage 3.7 exporters.
Maya and 3d Studio Max Exporters Sample level files.
Documentation (including step by step instructions for using DEdit and ModelEdit).
Links to on-line resources

Download Aliens vs. Predator 2 Editing Tools