Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
Mediamodifier - Create beautiful designs and product mockups in seconds.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
mockDrop - Is a webapp for creating free device mockups including your screenshots.
keezy - A colorful soundboard. Play with music.