Find rational approximation to given real number. Based on the theory of continued fractions if x = a1 + 1/(a2 + 1/(a3 + 1/(a4 + ...))) then best approximation is found by truncating this series (with some adjustments in the last term). Note the fraction can be recovered as the first column of the matrix ( a1 1 ) ( a2 1 ) ( a3 1 ) ... ( 1 0 ) ( 1 0 ) ( 1 0 ) Instead of keeping the sequence of continued fraction terms, we just keep the last partial product of these matrices.

Shows cute notifications in frontend. No need to manually create your own html/css/js to show Rails's flash[:notice] or other flashes. This handles it nicely + you can customize it.

Identify and remove old gems

RSpec 2 library to facilitate creating generator specs

an easy way to clone all your projects from github

Unicorn HTTP server multiple application runner tool

Fairly low-level client library to access Google Analytics Feeds

As Puppet manifest files change, run puppet-lint on them

Guard to render templates.

Easily create bots that can respond to anything!

Easy access and creation of "has many" relationships for ActiveRecord models. It uses a "vertical table" so schema changes aren't necessary when you add fields. Use this plugin to add preferences, options, flags, etc to your models

hatena-bookmark is simple Hatena::Bookmark AtomAPI library.

A rack app for monitoring application health that can be attached to your rails application

Tools to automate deployment to Heroku. Heroku is already automatic, but if you like to compile all your SASS and compress all your CSS&JS files before committing to Heroku, this tool is great for that

jruby wrapper for Esper (Stream Event Processing)

mesh network builder with ZeroMQ

HTML Acceptance lets you accept warnings/errors. Less noisey validation will hopefully let you build html validation into your test suite, but break the rules if you must.

Convert a size string like 1.12KB to the number value in Bytes.

Runtime tracking of finite data sets

Ruby class to validate iban numbers