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Pangea Software, known for their 3D Mac games, has allowed some of their older games to be ported to modern macOS, Windows and Linux, and be available for free. These were originally commercial software releases. E.g.
- Nanosaur (1998, US$19.95)
- Bugdom (1999, US$19.95)
- Cro-Mag Rally (2000, US$19.95)
- Otto Matic (2001, US$34.95)
Apple shipped Macs sold around those years with one of these games included.
Otto Matic is one of like 5 things I remember from the first couple years of school, (profanity) baller of a game, have to give it a download now, cheers OP.