Somewhere else in this thread I asked for the list of licenses as I see most of these products keep the parts with the most work closed or under a license that many companies won’t touch (agpl or n2n license). It seems that almost everything is MIT; that is pretty refreshing for something like this. Check alternative solutions and you’ll find trivial parts open sourced and the hard parts proprietary or unusable in other software because of the license choice.

Kudos to the team of total.js. Who cares if they offer some paid stuff; because of the MIT license anyone can. If they don’t do it, someone else can and offer it all the same. As long as vital parts remain MIT, I cannot see how this is a proprietary software operation.