gemfile-gutter
An Atom package which adds a gutter to your Gemfile and Gemfile.lock, showing each gem's installed version. Clicking the gutter opens the gem on RubyGems.org.
Installation
apm install gemfile-gutter
Usage
By default, gemfile-gutter will be shown automatically when you open a Gemfile. You can change this behavior in the settings or toggle the gutter with its keybinding CtrlAltG.
How it works
gemfile-gutter parses the Gemfile.lock to find the installed versions.