Ruby code converting unified diff to HTML similar to changeset screen at Trac
Visual XML Schema differencing tool Static site generator
A more helpful way to view differences between complex data structures in RSpec.
Rendered Markdown differ.
Easy Diffing in Ruby
RSpec formater that produces errors output easily consumable by automated tools
SiteDiff makes it easy to see differences between two versions of a website.
HTML to PDF converter based on WebKit2GTK+ and GirFFI
Line mapping between original and new
Find source repositories for ruby gems. Open, compare, and update outdated gem versions
Enable fancy colored diffs in your minitest assertions
Transforms Eclipse cheat sheets (XML) to DITA with Ruby, XSLT, XPath, Nokogiri
diff for epub files
A gem to compare two PDFs and output the differences using diff-pdf