Redcar Plugin for RSense
Using RSense, this plugin provides highly precise code completion for Ruby.

Requires Java Runtime Environment 1.5 or later. SunJDK and OpenJDK are supported

Installation on HEAD
    cd into ~/.redcar/plugins
    git clone git://github.com/Samsinite/rsense.git
Installation on gem version
   cd into ~/.redcar/plugins
   git clone git://github.com/Samsinite/rsense.git
   cd rsense
   git checkout --track -b lmod origin/redcar_3.5

Ctrl   / (Linux/Win/Osx)

Or change the key-binding using the RSense menu under plugins