EmuNations

NanoBoyAdvance is a multiplatform Game Boy Advance emulator focusing on accuracy. It has been reported its CPU and timing emulation is more accurate than software emulators. It also has HQ audio mixer and quite a few other nice post-processing options (ghosting simulation, color correction, etc.)...

RomVault is a GUI-based rom management tool and can be seen as an alternative to Clrmame Pro with additional features at managing large numbers of DAT and/or Roms in a more streamlined process.

No$GBA is currently the fastest working GBA emulator, though not the most accurate on GBA and even less on DS. It supports multiplayer and is able to load multiple GBA/NDS ROM files for linking games...