DHH posted a gist sharing HEY’s Ruby dependencies for the curious. It’s a pretty stock Rails app with MySQL (?!) and Redis stores, Elasticsearch, and a few other niceties. One line that caught my eye was:

gem 'turbo', github: 'basecamp/turbo'

That points to a private repo, so there will probably be some new open source turbolinks stuff here real soon. Anything else in this Gemfile catch your interest?