[ComNik]

I think Finda (https://keminglabs.com/finda/) fills a similar need, runs offline, and indexes lots of other stuff as well. Although I think it is not possible to assign additional keywords.

(Not affiliated in any way, just a user)

[Semaphor]

Mac OS only btw.

[jkmcf]

The site’s ‘marketing’ material is worth the click!