mdfinder.app 0.9.3-1build1 (arm64 binary) in ubuntu bionic

 MDFinder is a an application to search items already indexed by the
 GWMetadata indexing system, a GNUstep implementation of MacOS X's
 proprietary Spotlight. Searches can be saved and are automatically
 updated if the corresponding files change. Indexing is done in the
 background and is switched off by default. To enable it and
 configure the search path, use the dedicated module in
 the SystemPreferences application.