RSpec matchers for database queries
Flexible, expressive pattern matching for Ruby
Flexible type system for Ruby with coercions and constraints
Flip lets you declare and manage feature flags, backed by cookies (private testing) and database (site-wide).
libgraphqlparser + graphql gem
Ruby implementation of GraphQL
A tooltip library in CSS for your lovely websites.
Some foamy head is good in your brew, but you don't want a pour that is all head.
Cutting Edge WebRTC Video Conferencing
NMEA and ublox GPS parser for Arduino, configurable to use as few as 10 bytes of RAM
Raven is a Ruby client for Sentry (getsentry.com)
Restarts an app when the filesystem changes. Uses growl and FSEventStream if on OS X.
Source for emberjs.com