Database backed asynchronous priority queue -- Extracted from Shopify
Web interface for the grep and tail -f unix tools. Useful for real-time log analysis. Remotely related to splunk
Image server / proxy that can resize images on demand based on common file prefixes ( such as _small, _medium ) and apply other rmagick effects. Supposed to be used between a Squid/Varnish and S3
download your kindle highlights and email random ones to your inbox
HTML Editor for the liquid language (syntax highlighting, basic error checking etc)
Allows you to protect controllers by requiring login to a Google Apps for domains account. Great SSO solution for small companies.