UPKUtils is a set of utilities for analyzing and patching uncompressed UPK files. Since v.7.0 the set includes HexToPseudoCode tool - hex code decompiler, which produces ready-to-modify PatchUPK/PatcherGUI scripts.
Have no interest in moving on to XCom Enemy Within? Don't want to play XCom Enemy Unknown after patch 5 and patch 6 destroyed all the mods?
This XCOM: Enemy Unknown mod allows players to test their soldiers in Psi Lab again and again until they get Psi Gift.