[PhasmaFelis]

Not Id, but Apogee, pioneered "the Apogee model" of shareware with the Kroz trilogy in 1987. Apogee published Id's Commander Keen and Wolfenstein games.

[sien]

Which is playable on the internet archive at

https://archive.org/details/1990SuperKrozTrilogy

[npongratz]

I thought of Kroz immediately when I saw yesterday's Unscii submission:

https://news.ycombinator.com/item?id=13185932

http://pelulamu.net/unscii/

[swivelmaster]

Ah, yes, I forgot about this! Thanks for the correction!