A file can only be in one folder. But with tags, a file can have multiple associations. However, most filesystems only support folders but not tags. That is what Tagz solves.
Tagz uses file names to store tags in brackets. This makes it better than most tags software which store tagz in a proprietary database. Since the tags are in the file names, they stay with the file when you move it to another computer or even to another operating system. Also, if you decide to stop using Tagz, you still have the tags with your files and you can use your operating system's search instead.... More Info »
Tagz is based on the unix philosophy of doing only one thing and doing it well. It does not try to be a file manager, a note taking app, a todo list or a media player. It enables you to quickly locate a file using tags or its name and open it using your favorite app.
Tagz enables you to quickly add or remove tags to multiple files at once.
Tagz enables you to save your collection of files in a list so you can load all the files again quickly. Tagz is cross-platform and works on both Windows and OSX.
Link to official Tagz site
One time purchase (perpetual license) that cost about $20
File-organization File Searching File Tagging Indexed search Local Search Tag based Visual Tagging
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computer-files-search desktop-organizer document-management document-management-software document-management-system document-manager document-organizer document-organizing file-management file-organization file-organize file-organizer file-rename file-renamers file-search file-search-engine file-tagging getting-things-done indexed-search local-files-search local-search media-organizer multi-file-rename note-organizer organize-documents organize-files organizer organizing-files productivity-tool rename-files search-tool tag-based tag-based-file-management tag-editor tag-files tag-management-system tagfiles tagger tagging tags visual-tagging