Novell Netware was popular in the 90s, very good on Sun boxes. It kicked the arse out of Microsoft Server software.
Novell also had (IMO, and in the opinion of many experienced typists including my wife) the definitive word processing solution, WordPerfect. WordPerfect 5.1 was the benchmark.
With WordPerfect 6.0 they adopted a Windows WYSIWYG approach. They got as far as 9 or 10, perhaps 11, not sure of their current status.
Bill Gates went all paranoid on how their WordPerfect 6 might look more advanced than MS Word, so he bumped MS Word straight from 2 to 6.
Corel bought out Novell around 1996/1997. I think it was just the WordPerfect Office Suite which included the word processor, as Novell continued on with their Networking business.
Linux - Novell released a Novell Linux enterprise solution in the mid-Noughties, around 2005. They also bought into, or bought a share in, SUSE the German Linux Server firm, whose free to home user version is openSUSE.
Corel also has a Corel LInux, but that folded years ago.
That's the best I can recall. Wikipedia will likely have more.
Xfce - good DE, I really like it. It has one PITA for multi-multi-booters such as myself, unlikely to affect anyone else.
When you open GParted and work in it, and then close GParted, it automounts every single removable drive, in separate windows one by one, in my case recognising 40+ Linux Distro root partitions as drives.
Haven't got a workaround for that yet. If it annoys me enough I'll make a Thread of it - probably good for the soul for Wizard to ask a support question
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Wizard