Back in 2014 John Hall found the source to some of the old stuff, including Keen 4,5,6 https://games.slashdot.org/story/14/09/17/133228/commander-keen-keen-dre

Back in 2014 John Hall found the source to some of the old stuff, including Keen 4,5,6 https://games.slashdot.org/story/14/09/17/133228/commander-keen-keen-dreams-source-code-released https://games.slashdot.org/story/14/09/17/133228/commander-k... The game was bought by fans, the source was released and Keen Dreams was published on steam. https://github.com/keendreams/keen https://github.com/keendreams/keen https://store.steampowered.com/app/356200/Keen_Dreams/ https://store.steampowered.com/app/356200/Keen_Dreams/ The ownership of the older stuff is quite fragmented.