Hi again, I just remembered two more "things" of the 3.1 days..
Programs for creating 3D graphics, either through stereoscopic or anaglyph pictures (red/green or red/blue, red/cyan).
These were inspired by the "magic eye" book series and their spin-offs, I assume.
- By the way, if you use a CRT you can also make yourself DIY shutter glasses.
All you need is the driver software (archive.org etc), some generic shutter glasses and a DE9 plug.
Then you could easily interface them to a COM port (a single RS232 pin is used to activate the shutter + a ground pin).
Depending on the type of "driver CD" you got, Windows 3.1 sample applications might be included.
Back in the 90s, I was trying out some home planning software, if memory serves.
Rubrick cube solver programs. I've seen quite a few versions (shareware).
Games wise, puzzle / maze games in the tradition of "3D Monster Maze" (ZX81) were also still around.
If memory serves, there also was a faithful version for Win95 with an animated T-Rex.
Oddly, though, I remember playing it on my 286 PC, which ran Windows 3.1 merely. 😕
Edit: Glider, the game for Win/Mac, also was a thing.
And Video-CDs and CDis - Xing MPEG Player could play both of them. 😃
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