• We use Puma as the web server
• We rely heavily on edge caching with Fastly
• We use Cloudinary for image manipulation/serving
• We use Airbrake for error monitoring
• We use Timber for logging
• We use Delayed Job and Active Job for background workers
• We use Algolia for search
• We use Redcarpet and Rouge to parse Markdown
• We use Carrierwave, Fog and AWS S3 for image upload/storage
• We use a modified version of InstantClick instead of Turbolinks to accelerate navigation
• We are hosted on Heroku
• We use Heroku scheduler for scheduled jobs
• We use Sendgrid for transactional mailing
• We use Mailchimp for marketing/outreach emails
• We use Figaro for app configuration.
• We use CounterCulture to keep track of association counts (counter caches)
• We use Rolify for role management.
• We use Pundit for authorization.
• We use Service Workers to proxy traffic
• We use Preact for some of the frontend. See the Frontend Guide for more info
• We use Pusher for realtime communication between the application and users' browsers.
• We use GitDocs for beautiful and SEO-friendly documentation
• We use Git for version control.
• We use GitHub for hosting the source code and issue tracking.

This list is non-exhaustive. If you see something that belongs here, feel free to add it.