Draw.io or Diagrams.net

https://www.drawio.com/ Free to all users. Saves automatically to Google Drive. Tutorials can be found here: https://drawio-app.com/tutorials/

Instructions (for assignments/discussions): We recommend https://www.drawio.com/ for constructing your _______. Click the link and then click “Start.” You will be asked to choose a place in your Google Drive to which to save your diagram while working on it (just as with Google Docs). For any assistance with Draw.io, please see their tutorials.