Freesound - The Freesound Project is a collaborative database of Creative Commons licensed sounds.
Clubhouse - Serious project management tools you’ll actually enjoy using. Estimate, plan, build, and track your team’s work—all without the fuss and frustration you’re used to.
Hum - Songwriting for iPhone
Angle Audio - Live audio conversations as a service
RiffShare - Write down a musical riff, send to band members, collaborate
Commons - Private Clubhouse for your team to collaborate and connect