Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Usersnap - Visual Feedback - Usersnap helps your business with its versatile feedback platform to build better, more successful products and services with the help of user feedback. Collect feedback along your product development lifecycle. Try it for free.
Squash Reports - Keep your team in touch every day
Feedback by Pixelic - Painless design feedback and version control.
BugFeedr - Easily collect product feedback from your users.
Sesov - A community for anonymous design feedback