With Fluent Search, you can search for running apps, browser tabs, in-app content, files and more.
Available for Windows 10/11 only.
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Most things can be tweaked, including the interface, the default search engines, the prioritization of search results, the search tags, and more.
Pro Powerful filename search
It has a built-in indexer, but can also use others (including Everything)
Pro Active development
The developer is very responsive to the community, and releases new versions on a regular basis
There are no ads, and no paid version
The developer works for Microsoft and is already developing with an eye toward Windows 11 (while maintaining functionality under Windows 10)
Pro Plugin system
Users can develop their own plugins to extend the functionality