Ziflow - Online Proofing software from Ziflow keeps teams connected and collaborating by providing a single source of truth for creative review and approval.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
PageProof - Online proofing of anything and everything, made simple. Streamline feedback for easy collaboration, secure workflows, and faster approvals. PageProof. The smarter way to review.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
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.
Slack - A messaging app for teams who see through the Earth!