Whilst im updating the DCEmu sites, im focusing on the coders who made the Homebrew scene the most exciting legal place to be over the last 12 or so years (for me anyway), GPF is a coder who released lots of awesome software for the Nintendo DS, Dreamcast, GBA and Mobile Phones, just check this lot out:

For Dreamcast:

Emulators
gpSPDC(GBA Emulator)
RACE DC
DOSBOX DC
DC NeoPop
DC Nin64
Visual Troy Advance
Games
CloneKeenDC
OpenJazzDC
Cars DC
Lord of the Rings
Marfitude
REminiscence
Another World (AW/DC)
Super Mario Wars
Text Text Revolution
Trampalien Gunmen DC
YASFCave v1.0
Libraries and Dev Tools
DC Tool
DC Load

For Nintendo DS:

Emulators
FrodoDS(c64)
NeoPop(NeoGeoPocket)
Games
Duke3D(S)
REminiscenceDS(Flashback)
NDS YASFCave
XrickDS
Super Mario Wars DS
Defendguin DS
robotfindskitten DS
Libraries and Dev Tools
SDL libraries
romdiskfs library

Thats some list including the first GBA and N64 Emulators for the Dreamcast and Commodore 64 Emulator and Duke 3D for the Nintendo DS.

Check out his site here --> http://gpf.dcemu.co.uk/ - All downloads work perfectly too