Matter - Create a feedback-focused culture in Slack with Matter!
Invision - Prototyping and collaboration for design teams
Wipshot - Share with WIP and Review
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform
Spokk - Get your creations or ideas for blogs, designs, art, music, photos, YouTube videos or anything...
Pastel - Sticky note-based feedback collection tool for live websites