What are some alternatives?
When comparing Async and Cage, you can also consider the following products
FireRTC - FireRTC is the easiest way to call from your computer for free
ProofHub - ProofHub is an online project management software that helps you to plan, collaborate, organize and deliver projects.
Unfuddle - Unfuddle is a secure, hosted project management solution for software development teams.
Approval Studio - approval workflow tracking, artwork approval, asset review, design review, design review feedback, design revisions image annotations, onlineb proofing, pdf annotation,preview images, project managment
Slack - A messaging app for teams who see through the Earth!
Proof HQ - ProofHQ provides a medium for co-workers to annotate and collaborate before producing a clean, finished output.