Viewflux - Feedback, prototyping and collaboration for designers
Workgroups DaVinci - Project management and workflow automation software for marketing and creative teams.
Savahapp - The all-in-one design sharing, collaboration, workflow and app prototyping platform
ReviewStudio - ReviewStudio is an online proofing software built for easy collaboration on review and approval workflows, for all your image, video, web pages and PDF based projects.
Red Pen - Red Pen lets you upload your design, share a short URL, and get live, annotated feedback super-fast.
Proof HQ - ProofHQ provides a medium for co-workers to annotate and collaborate before producing a clean, finished output.