SugarDS v1.2 is an Amstrad CPC emulator for Nintendo DS and DSi by Nige Rideout (github). This version features :

• Less pops clicks when going in/out of selecting games
• Cleaner/Faster Disk Writes (less pause, better "DISK WRITE" notification)
• Improved Z80 timing - found a few more instructions that needed timing tweaks
• Improved CRTC emulation - fixed regression on Pinball Dreams, etc. Back to emulation of Type 3
• Fix for two-sided drive signal for FDC (nothing seemed to be affected by this... but better to be accurate)
• Improved pan/scan for Mode 2 - auto-center and smoother scroll
• Improved offset handling - cleaner 1 pixel move and faster press-and-hold
• Added ESC as a possible key map

And if you are curious and you go check his Github profile, you will see that he has written several other emulators for Nintendo DS and DSi.