FamiTracker is a free windows tracker for producing music for the NES/Famicom-systems. The interface is based on MadTracker and should be easy to use if you've been using trackers before.
One of the features is NSF-file exporting. That allows music created in this tracker to be played on the real hardware, or even for use in your own NES-applications.
Some other features:
* Full real-time emulation of all channels
* Internal PCM to DPCM-sample converter
* MIDI input devices are supported
* NTSC & PAL modes are both supported