Rosegarden Software for Windows [Download]

The MIDI sequencer that features a rich understanding of music notation along with basic support for digital audio

Features
MIDI and audio sequencer with unlimited tracks
Rich music notation editing capabilities
Large built-in database of real-world instruments to aid composers
Support for 100+ MIDI playback devices
Support for DSSI synth plugins

Legal Notice:
I am in compliance with eCrater and an authorized seller of this software under the GNU/GPL license, which allows for reselling.