Brand new: try Google Docs, Spreadsheets, and Drawings without a Google account! Check it out: https://docs.google.com/demo
— Matt Cutts (@mattcutts) June 4, 2010
Back in 2010, Google made it extremely easy for anyone to check out Google Docs. There was no need for a Google account. If you had one, you could have played with it without logging in.
You got the ability to use Google Docs apps right inside the browser as a guest. You even got a temporary URL that you could share with friends to check out collaboration features.
Sadly, that feature has disappeared from the Google website. I am not sure when this happened.