Ocean beta - Make music with friends in your browser
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
iO-808 - Rhythm composer modeled after Roland's TR-808 drum machine.
Mediamodifier - Create beautiful designs and product mockups in seconds.
Music Box Fun - Make and share music box songs online
mockDrop - Is a webapp for creating free device mockups including your screenshots.