I don't know of any, and I wouldn't recommend bothering with them anyway. The game is fine as it is, there are a few skills that are useless, but it would take a revamp of the entire game in a new engine and with new levels to cure that.
(See: Swimming and whichever one it is that lets you use hazmat-suits/armor for longer, heavy weapons is almost not the most useful skill in the game.)
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