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I dont mean to be too pedantic but open source for a linux desktop environment kinda should go without saying?

Rather, I couldn't imagine using a closed source one.

They exist, for example SteamOS has closed source desktop shell based on Steam client

Their gamescope compositor is free software at least.

Was it Caldera that shipped a linux with Motif?

(We're talking three decades ago now)

fwiw I can remember all the turmoil when Qt had no free tier and KDE was work of the devil

If you or anyone else want a trip down memory lane around that topic, peppered with some interesting revelations, this video is worth checking out:

KDE: The Documentary — The Story of Free Software Underdogs