This is not a free engine for HTML5 games. You are required to sign up to release a game on their proprietary * distribution platform* and give them 30% of your net revenue. Very misleading headline.
From the page:
"We supply your team with the Turbulenz HTML5 JS engine and all the Turbulenz APIs, free of charge. You bring a great game that embraces the way the web works; dynamic, social, and connected. We provide engine technical support, payment processing, analytics, game marketing services, and in some cases we may fund or co-fund the development of your game.
"The end result is a direct revenue stream, full control over the marketing of your game, and your game reaching millions of game players on many different devices and web destinations. Developers retain 70% of all net revenues."
Oh, and their platform seems immediately awful too, considering that you need to sign in to even SEE a single game they're offering.
A shame, too. Was hoping for a nice, free alternative to the Impact Engine (http://impactjs.com/).