The Elder Scrolls: Morrowind is free on the Bethesda website for today only. https://elderscrolls.bethesda.net/en/morrowind
Enter the code " TES25TH-MORROWIND "
*as per usual Bethesda standards, the site is broken and the redeem code feature doesn't work. Will they get it fixed before the offer expires? Magic 8-ball says outlook unclear.
Edit: Seems like it's working now
Edit again: They've extended the offer through the weekend to make up for their incompetence.