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File tagging software?
(hexbear.net)
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I know KDE's Dolphin has this built in, but I'm so afraid to use it because I imagine it'll take ages, and it wouldn't be recognized by anything else. 😬
I think it might store tags in linux file system xattrs so other software (or scripts) could access and index it.
Just to add...because xattr it's also "easy" (for some definition of easy ;)) to add/modify tags from the shell making mass-tagging feasible (as requested by OP). Second answer here should give a decent starting point....