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Re:Ask HN: Which closed-source software would you most like ... by jazztoken on Sunday May 21, 2017 @04:29PM (#14389100)
Dwarf fortress. Incredibly complicated simulation and procgen code written by a guy who admits to having very little engineering knowledge.
Re:Ask HN: Which closed-source software would you most like ... by SOLAR_FIELDS on Sunday May 21, 2017 @05:36PM (#14389379)
I think he has spoken about his development methodology and codebase in interviews. From what I remember based on his description it would horrify any professional engineer who saw it but it seems to work for him.

Here is the AMA where he briefly touches on some of his implementations:https://www.reddit.com/r/IAmA/comments/1avszc/im_tarn_adams_...

Re:Ask HN: Which closed-source software would you most like ... by btschaegg on Monday May 22, 2017 @03:28PM (#14396259)
This is the reason DF sprang to mind for me, too. From what I gather, tools like Dwarf Therapist work by directly manipulating the game's memory. If it were open source, I'm sure there would be some halfway sane plugin system by now.

Also, having the source code would mean that one could compile it for ARM devices...