My first job involved installing SCO (a bit later than Xenix, SCO System V) at customer sites from a huge pile of floppies. You had to pay a few grand extra for the compiler. GCC was a revelation and a life changing discovery just a bit later, and the beginning of the end for SCO. I have fond memories of it though, proper multi-user Unix on a 386/486 otherwise only fit for word processing. Shame its name was later dragged through the mud by intellectual property scavangers, and it's great to see this stuff being liberated.
Interestingly enough Linux already supported iBCS2 by 1995. So a lot of Intel SVR4 (eg. SCO) software could already be run under it by then with varying degrees of success.
I really dislike what SCO/Caldera/whatever did in the mid 2000s, but in 1999 Caldera OpenLinux 2.3 was the OS that introduced me to Linux (it was given with some magazine). To this day i still consider it the most well-put together Linux system i've seen, a single CD containing a desktop environment (KDE1) with applications that felt like they were designed with each other in mind instead of a collection of random applications, almost no redundant applications, development tools for a bunch of languages, documentation for everything - including even tutorials and guides to the system and the tools - available right from the task bar[1], applications for almost every task and all that working fast even on the 200MHz/32MB RAM PC i had at the time.
Of course that was largely due to the efforts of the Trolltech/Qt and KDE project which provided a fast and featureful toolkit, desktop environment and excellent documentation (well, more on the Qt side, the KDE docs were good but it had a lot of filler), as well as the TLDP which provided most of the "general" Linux documentation. Still, Caldera (or whoever made it) put everything together (and also decided what to not put in - which is also very important) and made an OS that looked very polished.
To this day i have never seen anything like that beyond minimalist purpose build distributions. Most distributions focus on including anything and everything with little thought on integration or even documentation (i really REALLY dislike how Debian and all of its derivatives put documentation in separate packages and especially dislike how for many FSF projects they put it in a separate repository altogether - i know why they do it, but i still dislike it). The closest i know of is Slackware but even that contains a ton of redundant stuff and the main reason i consider it the closest is that the majority of other distributions do not even bother to provide an ISO (or set of ISOs) for "complete" installations (which is kinda natural since almost all distributions nowadays try to contain every software ever made - even RedHat and some derived distributions like CentOS have an "everything" ISO that is really meant for mirrors, not users).
[1] (the only weird part is that the Linux user's guide, which you'd expect to be the first thing someone would read, wasn't accessible from any of the buttons and in fact even though it was available and installed, it was only available as a DVI file that wasn't viewable with KDVI and you had to convert it to PS and/or PDF manually - something that was obviously outside the experience level of anyone needing it in the first place :-P)
Speaking of liberation before there's a proper source code release may be quite strong wording. And I doubt that the copyright holder(s) actually endorse this dump; at most a blind eye is turned.
https://archive.org/download/Xenix386Ports
It contains Pascal, Basic and VP/ix (i.e. the package that lets you run DOS software under Xenix)!