Mid-Life, Edge, Cluster, Grid, and Spiral quadrants are identical except for shape. Ancient has more nebulae and black holes and such. Several mods add more variety. Proportions, AIC, Krsqk Quadrant Mod, QuadMod (IIRC) and of course the already mentioned FQM. Krsqk Quadrant Mod and FQM just add new quadrants, systems, etc, without changing the stock techs and components and such. Devnull Mod incorporates a much older Version of FQM (1.12 IIRC, and FQM is now up to 1.21 for the "standard" Version). AIC is having the latest FQM Version built in to it, while keeping the custom quadrants it already has. The Atrocities Star Trek Mod (AST) and the Star Trek Mod both incorporate FQM Deluxe. There are probably others I have forgotten to mention.
[ November 14, 2003, 22:35: Message edited by: Imperator Fyron ]