The following Ruby Gems are used in Discourse:
- pg
- redis
- em-redis
- Event Machine
- Active Model Serializers
- Sidekiq
- Therubyracer
- Guard
- OJ
- rack-mini-profiler
- sass
- rest-client
- rails3_acts_as_paranoid
- activerecord-postgres-hstore
- fastimage
- seed-fu
- sanitize
- clockwork
- i18n-js
- pbkdf2
- fast_xs
- koala
- has_ip_address
- vestal_versions
- coffee-rails
- uglifier
- hpricot
- uuidtools
- rinku
- ruby-openid
- rspec
- shoulda
- turn
- jasminerice
- fabrication
- mocha
- simplecov
- image_optim
- certified
- rb-fsevent
- rb-inotify
- terminal-notifier-guard
- pry-rails