FamiTracker is a professional but simple and easy-to-use 8-bit digital music producing freeware for NES/Famicom (FCDS) emulators. It comes with concise UI and powerful features, supports music import/export, automatically generates NSF file (so that the music you produce can be played in emulators), and is capable of converting music format. It's regarded as a must-have tool for many 8-bit game music producers.