Since the acquisition of SciTech, I'm unclear where to find Display Doctor or UniVBE or SNAP or Nucleus or [s]OpenSNAP[/s] or name-of-the-week. I'm also woefully out of date on which version or versions would be best for running... well, let's say "most games" and/or "fussy games." Could someone point me at such a thing as a mirror of ftp.scitech.com, or simply a handy place to find one or more of the free and more-compatible SDD releases?
Also, DOS32a: is this still a recommended replacement for DOS/4GW? I do realise this is OT, but I'd like to get my old copy of Quarantine working, and I still recall the hell, quite freshly, that I went through to get it working at all, ever. Finding that delicate balance between no attempts to use UMBs and not having enough low RAM to fire off the DOS/4GW stub is etched forever in my mind.
I see that DOS/4G[W] 2.01 have become available since, but I can still easily recall Quarantine causing fascinating crashes, including "ROM BASIC NOT FOUND" and the like when I tried simply replacing the 1.8 stub-or-loader-or-thing with 1.97 and versions in between. Also, I do not have USD$299 to spend on experimenting with such a thing.

lolwut

Uh.... um... well... you could start with... huh...
Just what exactly are we discussing here?

Speak English not babblese please.
I am not a bot.

While I've never heard of the slew of apps in the first paragraph of the OP, from the rest of the post it sounds like what you're really looking for (or rather, what you really need, but are apparently NOT looking for), is DOSBox.

UnivBE used to be a little program packaged with games in the early90s or so. It was used to override crappy emulation of the graphics cards of the time to get games displaying properly.
It seems the parent company got took over recently, and it's not available (easily found). I'm checking around some, and almost all the download links are dead now....
EDIT : ah ha!! Clicky Link

Dude, the first thing that you find when you type in "Dos emulator" is DOSBox...
Still, true that. DOSBox is the ultimate dos emulator out there, nothing else I've ever seen comes close to it.
Hell, it's what GoG uses most of the time for the old games.

Uhm, I would suggest you to ask/search for on the mighty VOGONS forums....

Thanks!
Everyone else: I'm posting in a forum attached to a company that sells a lot of old DOS games. If you're here for the Windows games, fair enough, but if you're here for the 0ldsk00l DOS love, I post in the assumption that you know what a UMB is and why you would want one; what VBE is; and (preferably) that you've seen the message NO ROM BASIC at least once.
If you used DOS and never did see that message, clearly you weren't trying hard enough. :D
(And, please, don't ask me what that error is. It's three words in English with an acronym and the name of a programming language.)
ETA: For anyone who was interested in the answer, I've found a more complete collection of the SDD stuff released as freeware before all the site content was removed:
http://www.vogons.zetafleet.com/viewtopic.php?t=15190

Well excuse me, oh mighty DOS master. You said you wanted Quarantine to run. I know from personal experience that DOSBox does the job. If that's not "oldskool" enough for you, please accept my most sincere apologies.
I didn't use DOS for that many years, since I only switched from my trusty Amiga 500 to a PC in '94. Before the Amiga, it was the C64 that took up my attention. Thus, I didn't have all that many years of having to fiddle with config.sys and autoexec.bat in order to free up those last 2kB of RAM that would allow me to play Desert Strike.
If you ask for help, and then chew people out for trying to help you, don't expect to make a lot of friends here.

aloishammer,
Most people are here for the dos "games", not the OS itself. Hence what ever will let them load up the games most effectively and easily is what they'll care about. That happens to be DOSBox.
Not everyone can claim to have cut their gums on DOS 2.0. ;) (Wow, that was a long time ago)

Some of us do remember PC-DOS and early versions of MS-DOS, but we do like using DOSBox, since it's very easy to use, very customisable, and relatively hassle free to run the majority of DOS era games.
I'd also point out that there are quite a lot of DOS games available for purchase on this website, of which I own a fair number, and expect to own more in the future.
It did appear that you decided to fill your post with unnecessary levels of jargon which would indicate you would have been better served asking your questions on a different forum, especially since the easiest answer (as others have said) for running Quarantine is using DOSBox.

Not to mention coming across as a bit of a dick. Just saying.