Fresc - Image collaboration Done Right
Invision - Prototyping and collaboration for design teams
workroo.ms - Visual collaboration for everyone: files, tasks and all the people you need – finally united in one...
Red Pen - Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast.
Workgroups DaVinci - Project management and workflow automation software for marketing and creative teams.
Pastel - Sticky note-based feedback collection tool for live websites