klaep - music collaboration - klaep is a social music collaboration network for musicians

productboard - Beautiful and powerful product management.

Pyro - Spotify music voting for parties

Aha - Aha! is the new way to create visual product roadmaps. Web-based product management tools and roadmapping software for agile product managers.

Playlistful - Collaborative playlists for parties!

ProdPad - ProdPad helps your team gather ideas, surface the best ones and turn them into product specs, and then put it all on a product roadmap.