Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
TMSU - TMSU is a tool for tagging your files.
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
TAGXFS - Tagxfs is a semantic file system. It extends the user space file system to a tag based hierarchy.
FreeCommander - FreeCommander is an easy-to-use alternative to the standard windows file manager. The program helps you with daily work in Windows. Here you can find all the necessary functions to manage your data stock.
Danbooru - Danbooru is an advanced, tag-based image board system that is based on Ruby On Rails.