The gp32 scene is really tiny. I myself am Dutch and I have only counsiously seen one fellow Dutch person on these boards. So there might even only be 2 Dutch gp32 users (maybe more). From what I gather there´s quite a number of Germans, Spaniards, Italians, English & Americans.
The number of developers is rather small. I myself have installed a developers kit on my computer, but haven´t progressed enough past the "hello world", small demo stage. Let alone homebrew game/emu development.
As for the emulators that are actively being worked on, that I know of:
Tg16 emulation
c64 emulation
Snes emulation
Nes emulation
Atari ST
Ryleh´s emulators (some of them are public with a good chance of more releases).
Emulators of systems that a regularly use and I consider almost perfect are:
Tg16 - Gpengine 0.4 ? (smooth screen updates, little frameskipping)
Nes - LittleJohn 0.4 (smooth screen updates, hardly any frameskipping)
C64 - frodo (for some reason my mspacman.t64 file stopped working with the last beta).
Atari ST - Castaway 0.13/0.14
And a lot of very nice homebrewn apps are appearing.
Maybe I´ll try my hand at a good remake like recently the Giana Sisters-team did.
Cheers, Mark