can we add:
RECORDER_TAG
RENDERER_TAG
TEACHING_TAG (or INSTRUCTIONAL_TAG)
CHORUS_TAG
PHASER_TAG
FLANGER_TAG (EFFECT_TAG is too generic)
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I'll add RECORDER_TAG, and maybe expand the effects.
I sometimes look through the add module list looking for open source modules, so
maybe a OPEN_SOURCE_TAG?
A FREE tag could be useful as well, but FREE isn't really something that is determined at plugin build time (and can change at any time). For the most part, OPEN_SOURCE would be known at build time and not as likely to change for that particular build.
As a user, I sometimes want to have modules tagged as FREE or FREELY_DISTRIBUTABLE especially when planning to share a patch.
(I suppose the tags could be more specific about the licensing (ie, BSD3, GPL2+, etc) but that is a long and controversial list to enumerate and not super useful at runtime. Maybe better as an additional piece of metadata on Plugin or Model if it's worthwhile at all?)
No, tags should be for functionality, not legal details. Put that in the plugin manifest that you submit to https://github.com/VCVRack/community
METER perhaps?
Some existing modules that could use that tag:
CV voltage meters
Misc
VU meters (though, maybe more VISUAL than METER...)

Use "Visual" for all of the above.
Most helpful comment
I'll add RECORDER_TAG, and maybe expand the effects.