User review spotlight: Ultima IV: Quest of the Avatar (DOS)

Business Model : Freeware / Free-to-play / Public Domain

Free games are just that: Free. No money is necessary to obtain and play a free game.

Freeware games are games that are released by the author for everyone to play, but the author still retains copyright. You cannot sell a Freeware game for profit without the consent of the author.

Public Domain games are literally in the public domain; any individual can do what they want with them, including selling them for profit.

Freeware / Free-to-play / Public Domain is part of the Business Model category.