I remember famo.us - "a free, open source JavaScript framework that helps you create smooth, complex UIs for any screen." as they say on the 'deprecated' website: http://deprecated.famous.org/

I never signed up for their pre-release access program thing. I only learned of their existence when the company's twitter account, and then the company's founder's twitter account, started following me. I was, of course, very flattered - I had less than 30 followers at the time! Six months later the company pivoted and most of the devs got fired. These two events are in no way related!

I remember the hype behind that one! "pure DOM animation in 60fps buttery smooth" or something along those lines, right? They had that periodic table demo.