GMail
After you have chosen to Turn on keyboard shortcuts in the settings section, you can navigate up and down the inbox with j and k, press o to open the messages and u to (undo) the opening of the message (i.e. go back to the inbox).
Atlassian Stash
Navigate up and down the list of pull requests with j and k, press o to open the pull request u to (undo) the opening of the pull request (i.e. go back to the PR overview).
Google Groups
Navigate up and down the list of posts with j and k.
Unreal Tournament
You can exit the Unreal Tournament game by writing :wq or :q!
😃,
as tweeted by icculus
BASH command line
If you enable VIM mode typing set -o vi, you can use a plethora of
vi shortcuts including k, l, 0, and
$.
