google-drive-ruby - Gem to read and write files and spreadsheets on Google Drive (or in Google Docs, depending on which branding you're using). There was a time when I could have really used this.
API Geriatrics - How to plan and manage the inevitable process of retiring an outdated API without pissing off all of your users.
Codescout - Search engine for Rubygems that tries to rank results in a sensible order.
OK Computer - Server health check endpoint for Rails application. Features sensible defaults & pluggable extensions. One less thing to build yourself.