[alexellisuk]

It's interesting to see this one launch (yes yet another sandbox.. I was getting worried we'd not seen one for a few days)

SlicerVM (est. 2022) is already used for prime time, not "free as in beer" but has pretty reasonable individual plans that include all features. Shares the core code with actuated. (Creator of both speaking here)

Feel free to take a look and see if gives you a little more than the others you mentioned. If not no problems, I realise some folks prefer free stuff.

[jFriedensreich]

What do you mean "not free as in beer"? Its not free as in anything? Sandboxes need to be open source, nothing else is acceptable.

[kjok]

Why should they be open source?

[jFriedensreich]

Same reason linux or databases need to be open source. A sandbox is not a nice to have or a feature anymore, it is as fundamental building block to running any software. You cannot depend on closed source building blocks, not as closed source product and especially not as open source product.