The Lorax is a full diff and patch library for XML/HTML documents, based on Nokogiri. It can tell you whether two XML/HTML documents are identical, or if they're not, tell you what's different. In trivial cases, it can even apply the patch. It's based loosely on Gregory Cobena's master's thesis paper, which generates deltas in less than O(n * log n) time, accepting some tradeoffs in the size of the delta set. You can find his paper at http://gregory.cobena.free.fr/www/Publications/thesis.html. "I am the Lorax, I speak for the trees."

LtiProvider is a mountable engine for handling the LTI launch and exposing LTI parameters in your rails app.

A Ruby interface to Magento's REST API with automatic OAuth handshaking

Ruby Mail delivery method handler for Amazon SES

Import/export utility for Netscape Bookmark Format

MarkupValidity provides test/unit and rspec helpers for checking the validity of your documents. Shortcuts for verifying xhtml-transitional and xhtml-strict documents are provided as well. MarkupValidity will not only tell you when your document is invalid, but it will tell you what it *should* be.

Dryopteris erythrosora is the Japanese Shield Fern. It also can be used to sanitize HTML to help prevent XSS attacks.

Ruby library for Microsoft Translate HTTP API

Adds a sitemap.xml file (following the sitemaps.org protocol) to your Middleman site for major search engines including Google.

Run spell checks as a build phase in middleman

Format Japanese characters

MTDevise Rails 5.1 engine that adds multi-tenant basecamp style user logins (multi-tenant authetication using devise) to your ruby on rails application.

MundoPepino is a set of reusable step definitions to test Rails apps with Cucumber

A Ruby interface to the Amazon MWS Orders API, built on Peddler

The nanoc-toolbox is a collection of filters and helpers for the static site generator tool nanoc

a ruby client for the NetFlix API

Forms for Nguyên is Ruby library that could merge PDF fields by XFDF/FDF via pdftk.

Pretty-prints the contents of a Nokogiri document (as opposed to the object itself). Great to use in irb.

Adds support to Ruby for encrypting, decrypting, signing and validating the signatures of XML documents, according to the [XML Encryption Syntax and Processing](http://www.w3.org/TR/xmlenc-core/) standard, by wrapping around the [xmlsec](http://www.aleksey.com/xmlsec) C library and adding relevant methods to `Nokogiri::XML::Document`.

nom is a command line tool that helps you lose weight by tracking your energy intake and creating a negative feedback loop. It's inspired by John Walker's "The Hacker's Diet" and tries to automate things as much as possible.