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
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
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.
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Ziflow - Online Proofing software from Ziflow keeps teams connected and collaborating by providing a single source of truth for creative review and approval.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.