FSearch is a fast file search utility, inspired by Everything Search
Engine.  It is written in C and based on GTK+3.  It features:

  - Instant (as you type) results
  - Wildcard support and regular expression support
  - Filter support (only search for files, folders or everything)
  - Include and exclude specific folders to be indexed
  - Fast sort by file name, path, size, or modification time
  - Customizable interface

WWW: http://www.fsearch.org/