Trello board (also use it for personal life). I have lists that separate the different kinds of work that need to be done (dev, marketing, research, website, et

Trello board (also use it for personal life). I have lists that separate the different kinds of work that need to be done (dev, marketing, research, website, etc...) and then label them according to how easy/challenging the task feels to me. This allows me to easily be able to pick something to work on every single time.