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.
TagFlow - TagFlow is an intelligent files manager that use tags for organize your documents.
Tabbles - Tabbles use tags to organize and find files along with your colleagues.
oreno.imouto - Imageboard dedicated to high resolution anime scans, ecchi scans, hentai scans, moe scans, and...
allTags - allTags is a free, tag based file management application.
TMSU - TMSU is a tool for tagging your files.