I'm mildly bemused at the other comments treating this as a blast from the past. I use icewm today as a super low resource DE for a headless remote desktop system, with a major benefit being that it's all in one with no configuration needed; one unit includes panel, app menu, and window manager that work out of the box.
> treating this as a blast from the past.
Well, for most of us it is.
Why is it bemusing because you happen to have a use case for it? It's a 30 year old piece of software that only supports X11, which is itself rapidly becoming legacy software.
I use it as my main desktop for audio work.