My Top11 essential tools I could not live without.
Tobias van Schneider

Great list

Nice list! We already use a few of these as a team but I like the sound of f.lux and am definitely going to check out Hemmingway. A couple of my favourites you might not be aware of are:

LastPass which is amazing for managing multiple client and business passwords and even has touch ID for the iOS version.

MixMax for Gmail, this is one of my favourite Gmail extensions that gives scheduling, tracking and appointment making amongst other things to Gmail or Google Apps email accounts.