Dropbox - to store files - you get 2gb. If you download the dropbox from this link I get 500MB 🙂
Grammarly - corrects English if you will be working with foreign partners
Passpack - a place where you can store all your passwords. it can even save automatically if you add it as an app to your browser
ClickUp- task writing app - great for assigning tasks to other partners or employees
RescueTime an app that tracks your activity on the computer. At the end of the week or month you get a report and see how much you have worked or not worked on which project.