TagSpaces - TagSpaces is an open source platform for personal data management. With TagSpaces you can manage and organize the files on your laptop, tablet or smart phone.
HoudahSpot - Advanced File Search Utility for Mac OS X
TagFlow - TagFlow is an intelligent files manager that use tags for organize your documents.
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
Tabbles - Tabbles use tags to organize and find files along with your colleagues.
TaggedFrog - Based on the convenient drag ’n’ drop technique, TaggedFrog allows you to organize your files...