LastPass: A free password manager. This way you don't need to send yourself an email to reset every time you forget!
Google Calendar: Start using it now to set reminders and keep track of deadlines and events.
Todoist: an app for Windows/Mac/Android/iOS to keep track of your to do list
Equatio or Hypatia: These are text editors that let you type in 'Math' on Google Docs and Slides
Forest: An app that rewards you for focusing. Very useful for remote learning!
Toby: A tab organizer and bookmark holder.