Userfeed - Product feedback made for Intercom
Invision - Prototyping and collaboration for design teams
Fider - Fider is an open source, cross platform and free to use customer feedback platform for companies...
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform
ClearFlask - Open-source Product Feedback Tool with a Public Roadmap and Announcements.
Pastel - Sticky note-based feedback collection tool for live websites