I have fond memories of FVWM. I don't know where this was (Slashdot?), but back in the mid 2000's, someone posted a "Why are people not using FVWM? It's one of the most flexible window managers?", and linked to various people's FVWM setup. This led to a lot of folks (including me) switching to FVWM. I used it until switching to AwesomeWM around 2011.
You can see some (fairly old!) screenshots here: https://fvwm-themes.sourceforge.net/screenshots/
Glad to see it's still around.
Edit: Here's the thread (Gentoo Forums): https://forums.gentoo.org/viewtopic.php?t=80517
The thread ran a total of 121 pages over 7 years.
I used it until I switched to GNOME2 at some point, and I also have fond memories. Just seeing the title of this post recalled the desktops I had had over the years.
My linux days started around 95/96, and I was always using low-resource environments due to necessity. Other than FVWM95 the other system I recall using for a long long time was IceWM which was something I switched to around 1999/2000.
I used it on an IBM Workpad Z50 (WinCE device, really quite cute) booted into NetBSD. It had a fairly slow MIPS processor and 16MB of RAM but with a 1GB IBM Microdrive (spinning rust in a CF card format) and a wifi card (Orinoco Gold, recovered from a scrap supermarket barcode scanner gun) it made an awesome portable setup.
I believe taviso still posts on here. Pretty sure we chatted on IRC at some point. Anyway, it was taviso who had the coolest configs and that's where I got all my inspiration from, using it.
You know what? I might just fire it up on something, I'm sure I've got a netbook around here somewhere.
I switched over to using it because (I think) it was much lighter on memory than the window manager I was using. I remember it being very responsive, and looking quite nice for the time.