Here's a thought: I've just being playing 'Beginners Guide' which caused me to remember the 'Sophie's Choice' CD-ROM I had (actually still have but won't run) and I started to wonder if there might be a market (for want of a better word) for 'non-games' that are now lost to us. At present, I can only recall that title; Peter Gabriel's Xplora1, Explorapedia: World of Nature, Microsoft's Musical Instruments, and the SImpson Virtual Springfield - all basically educational (ok, not all). Some will have major rights issues (ie anything Microsoft) but might it be an area for GOG?
And I'd love to see P.A.W.S. The Dog Simulator! (programmable automate wagging system) on GOG

A very small one at best, IMHO.
From what I recall, maybe Microsoft's Encarta and Encyclopedia Britannica were the top sellers. Not many people are paying for encyclopedias now.

From what I recall, many of those interactive CD-ROM had terrible user interfaces for the sake of looking different and providing "interactivity". I do not miss them, to be honest.

Edit: double negative removed

There was an interactive CD-ROM of Sophie's Choice?

I still have a bunch of these on my shelves, and do pull them down and enjoy them occasionally. I honestly don't know if there might be a market for these, Paul. My guess is that many of them would be tough to get working on modern systems. In order to run most of them, I typically resort to the free VMWare Player to emulate my copy of Windows 98SE.

Additionally, as Gede wrote, the user interfaces in some of these titles were terrible, at best. That never stops me from having fun with and learning from them, but that could be an obstacle certain people might feel is not worth overcoming.

There are a number of non-game and educational titles on CD-Rom from the 1990s that I'd certainly welcome on GOG (I particularly enjoy those with FMV elements), though am not sure how many of them would be considered classic or significant to modern audiences.

Hey, thanks for the tip!

Purely for preservation it might be interesting, as long as they were cheap.
Which seems unlikely considering the interesting ones all have big names involved in them.

We've got The Manhole here, so why not?
We used to have Explorapedia in elementary school so I'd be interested in seeing it here again.

The "Magic Loon" CD-ROM experience needs a comeback!