Here are the last 4 generations of the 911, with the years of production in brackets:
964 ('89-'94) - didn't feature a GT2 or GT3 model
993 ('94-'98 )
996 ('99-'04)
997 ('04-'05) - only Carrera and Carrera S variants so far.
So within each of these series you had Carrera 2 & 4 (i.e 4wd) models, Turbo and Turbo S(FWD Turbo), GT2 (RWD Turbo), GT3 (NA RWD) models plus other versions likes Carrera RS's and so on
For more detailed info just do a search on google, there should be plenty of stuff out there