nixpkgs / ctags - Ctags generates an index (or tag) file of language objects found in source files that allows these items to be quickly and easily located by a text editor or other utility. A tag signifies a language object for which an index entry is available (or, alternatively, the index entry created for that object). Many programming languages are supported.
Homepage - http://ctags.sourceforge.net/
License - GPL-2.0-or-later