Invision - Prototyping and collaboration for design teams
TomatoApp - Visual feedback for your presentation. Engage the audience!
Red Pen - Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast.
TigerTalk - Seamlessly get feedback on your video presentations
Viewflux - Feedback, prototyping and collaboration for designers
Pastel - Sticky note-based feedback collection tool for live websites