PRIME CUTS: GAMMA WORLD D20 Machines And Mutants (6th ED.)
6th ed. is known for being Nano-tech focused, of which I am not a huge fan but here are the things I liked skimming through.
(loosely quoted from skim reading and adding my own quirks to suit.. sorry.)
A Gamma resident would be horrified by the measures used to slim down in ancient times.
In this book it is a 5000 pound behemoth that eats entire towns (the blob..) and was created as a slimming nano treatment before it was corrupted.
Attacks if survived leave massive bruising and gauntness that takes weeks to heal (con points lost)
If poured onto a a disassembled computer it may make a computing device but its interface will be alien and its complexity unnecessary.
It hates and attacks Grey Goo.
It detects life as being structurally coherent and complex enough to be left alone, however if wounded or recently deceased it my "fix" it or create chimeras.
New-flesh infoseed is transferred via bodily fluids, many Newflesh try not to bleed on people or engage in intercourse.
CUTE ROBOT FAMILIARS: robot puppies containing nanofab factories and simple AI.