NO$GMB
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NO$GMB is a Nintendo Game Boy emulator that can play most Game Boy and Game Boy Color games. There are two versions - DOS and 32-bit Windows. Like most emulators, the controls can be altered and the hexadecimal code can be edited, making it a suitable emulator for developers. The emulation is very accurate but lacks the support of the high color hack used in some Gameboy Color homebrews. Emulators capable of emulating the high color hack are KiGB and BGB.
NO$GMB is entirely written in Assembly language and came as low cost shareware, at the price of 5 German Mark or 5 US$ (approximatley 2.50 EUR). The registration itself was not really required as it just unlocked features which were useful for developers, but not required for regular gamers. The support for NO$GMB completely dropped after a cracker spread an illegal key. Martin Korth, the author of this emulator was not amused about this and entirely stopped the development of NO$GMB.
Another reason for not going on with the development of this emulator was the harassement after announcing the development stop due to the illegal key spreading around. Many users of NO$GMB didn't see this project as privilege, they entirely demand updates without having paid anything. Some of those "feedbacks" were published on Martin Korth's page and can be read here: http://nocash.emubase.de/mailcrap.htm