If you like BeOS, take a look at Haiku https://www.haiku-os.org/ , it's very nice and very usable system based directly on BeOS.
I've been a fan of Beos philosophy since the Personal Edition but never had the occasion to run it on steel as I was too poor to have two machines back in the days, and now I miss login/password prompt at boot on Haiku. But i'm following it closely and I hope i'll be able to install it on my X220 for a web/mail machine !
Vitruvian can potentially have everything Haiku has (it's the same identical stack BTW) but with the power of linux. It's cool if people could start to appreciate both visions.
And much better option, running the real deal, instead of some compatibility layer.