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no$gba is one of the most accurate GBA emulators for the DOS and Windows32 platforms and is written by noone else than Martin Korth. Since v2.2 it also emulates the NDS partitially. no$gba in it's base version is freeware but for a fee, depending on your legal status (hobbydeveloper or professional developer) you can order a key, which enables a debugger, which is THE item, no$gba is known for. Changes:

23nd January 2006 - version 2.2a

bugfix: fixed v2.2 instant crash after loading (occured debug versions only)