X Builder is a drop-in collection of block of Xara that are added to three Variants without extra effort.
Here is a demo site: https://xaratemplates.com/demo/xbuilder/02/.

The concept seems to be more refined that Xara's but I have not purchased as I was thinking of buying the professional pack outright.

Michal is a TG member (jarmoluk) so you can email him as he is yet to be granted PM access. He seems very productive so is missing his email enquiries, how Xara!

Acorn