There are many games (or versions of games) supported by ScummVM that you can't run in DosBox for the simple reason that they're not DOS games (or even x86).
The number of "obscure game engine" games actually outnumbers the LucasArts and Sierra games combined, and include some of the most popular and famous games of the era, like Myst and Riven (as well as the mentioned Zork games).
The Starry Expanse project is recreating them from scratch.
Now I’ll have find something with a DVD drive to actually read my Riven DVDs...
A google search brings up a lot of not-completely-legit-looking sites, and I'd hate to give money to some pirate. These games are amazing and I'd love to support the authors if possible.
The publishing rights for some games are stuck in limbo though, so you just have to dig up a used physical copy or pirate them.
I kinda wish they wouldn't though. A lot of these should just fall into the real of abandonware. A lot of these licenses just get sold off to big companies who try to do some long-tail nostolgia sales.
Some /really/ old titles are actually out of copyright (or the publisher has gone under and the license has been lost), but they're still sold through some services cause that's how public domain works.
Nobody has been dead long enough for any computer game to enter public domain by the lawful way of inaction.
There are some games that have been made available by the license holder. Like "Beneath a Steel Sky" which was released as freeware.
Some ScummVM supported games like The Neverhood however never got a new digital release. So you'd need to buy a used CD on Ebay for example.
Just for the reference, in most cases, those games are now owned by some publishers, and original authors aren't going to get anything.
As others have said you can some rereleased on gog/steam.
I encourage you to get a hold of the game. It's a nice puzzle gem that incorporates the humor of Douglas Adams.
One of the main parts is language, talking to the staff, actually typing, and communicating with them.
How well does this work? I can't think of any other game that has even attempted this since. It would be interesting to see what the state of the art could do with this. I think combining this kind of gameplay with voice to text for input and using either text to voice or voice actors for the character talking back could be super immersive.
In all honesty thanks so much to all the people that work on this project.
I didn't realise there was so much more to enjoy, thanks.