The most obvious is undoubtedly the find command, and find has become easier to use than it was years ago. It used to require a starting location for your search, but these days, you can also use find ...
The fd program is an alternative to find, which can search the file system using various patterns. It has many options to support a wide range of use cases, making it easy to find any type of file, ...
5 Linux file managers to try when your GUI just won't do - they're all free ...