Open on GitHub 
Provides commands to quickly view the current file on GitHub.com (The Website).
Usage
When editing a file in Atom, use the command palette or keyboard shortcuts to:
- Open the file on github.com
alt-g, o - Open the blame view for the file on github.com
alt-g, b - Open the history view for the file on github.com
alt-g, h - Open the compare page for the current branch on github.com
alt-g, r - Copy the github.com URL for the currently selected lines
alt-g, c
Inspired by the GitHub Tools package for Sublime Text 2.