Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Krue - Twitch for music: live streams from amazing musicians
JJazzLab - Fed up with boring backing tracks ? Try JJazzLab!
Soundscape - Sync your music with the open source community
Band-in-a-Box - Band-in-a-Box is so easy to use!