I'm surprised nobody has mentioned dwm. It took me a while to be converted, but tiling window managers are the bomb, and I'd never use a non-tiling one again. DWM isn't the only tiling one, but it's certainly excellent. Conky is a wonderful companion.
I'm honestly not familiar with dwm, it looks interesting and I wouldn't mind trying it out but yeah, I haven't really heard much about it.
I've been using dwm for more than ten years, and I just don't change (I sometimes try some other VM, but always and up firing dwm).
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