keezy - A colorful soundboard. Play with music.
Ship That Shit - Join 3 no BS events to help you ship that shit
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
CoFoundersLab - Meet 250,000+ entrepreneurs online
Splice - Music creation, collaboration, and sharing made simple.
Foundler - Online hackathon weekends. Attend every other week.