The Amazing Engine system was a nothing by itself but it had some really cool settings, For Faerie Queen and Country being my favorite.
Yes, we ran a
Tabloid! for a session, I've done conversion to Pendragon for
Once and Future King, and I ran
Bughunters using the
new World of Darkness which ran for several sessions (I threw in psychic abilities from
Second Sight and added a bit of
Justifiers and
Transhuman Space for flavor). I was going to do FQC using the rules from
Masque of the Red Death and I also was going to use
Gamma World 4th Edition to run through
Metamorphosis Alpha to Omega but that didn't materialize (I also thought about using it for the source of Aberrants for my Trinity/Transhuman space cross-over since I didn't want an Aberrant age). And I have used the races from
Galactos Barrier in other SciFi games (I have an
Alternity conversion somewhere). And I ran a
Magitech game using AD&D second edition for awhile and I did a 3rd Edition conversion where I allowed everyone to cast spells based on their bonus spells from Wis, Int, and Cha.