Text Comparison
- GNU DiffUtils (Collection of 4 console utilities for finding file differences: diff, diff3, patch and cmp) ("Creating and using patches")
- patchutils (Collection of diff-file utilities, like: combinediff, filterdiff, splitdiff, and grepdiff)
- similarity-utils (2 programs to help give a quantitative measure of how similar two files are. License: none, it is public domain)
- g_pochini [at] virgilio [dot] it/">BDiff (Tool to create diff-files between two binary files)
- colordiff (Perl wrapper script to create colored file diffs) (cvs)
- comparator (Python scripts for finding common code segments in large source trees)
- csvutils (Shell scripts to handle comma-separated-value, aka CSV, files. License: BSD-style.)