Apache Lucene open-source search software
GREP
Catalog your devices to search, analyze, and backup your files.
Command-line toolset for extracting text from files
A fast file search utility for Unix-like systems based on GTK3
multi-encoding strings(1) replacement with language identification
Library for adding search, sort, filters and flexibility to tables
Xapian index viewer
Powerful desktop search app for Windows, Linux and Mac
File type detector library
An open source search engine with RESTFul API and crawlers
UI frontend for sfbf, a useful application to search for largest files
Useful console application to search for largest files on file systems
Vim plugin for the Perl module / CLI script 'ack'
simple BNF parser makes xml markup of matches
data organising system for arbitrary files
a Finding, Sorting and Converting free software (file manipulation)
Tiny and blazing-fast fuzzy search in JavaScript
Tool to find symbols in Library or Executable
A Fast Duplicate File Detector with graph based semi-automatic cleaner