Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Elegantt for Trello - The most elegant way to manage your Trello projects
Octoview - The missing preview feature for GitHub
Hello Epics for Trello - Simplify your Trello board with parent/child relationships
Dyllo - A clean and simple way to view a Github user's information
TunnelVision - See your next Trello tasks every time you open a browser tab