- Jetstrap (http://jetstrap.com/)
- Divshot (http://divshot.com/)
- Easel (https://www.easel.io/)
I could see a company like Adobe wanting to get in on this.
Surely we want competitors in this area, there's obviously a need for it and a number of tools competing on features and price can be good for consumers?
To answer the parent, Adobe technically does have a competitor in this space, though it's not focused on bootstrap and it's kind of complicated: http://html.adobe.com/edge/reflow/
As someone with a product in this space, I'm confident each of the current offerings listed above will diverge sufficiently in the future, specifically in their target audience. It's still so early though.
And Max (yesimhuman) is right: it's pretty early, and we're all approaching the problem from different perspectives.
More flexibility: You can style elements, and you dont need to use the bootstrap containers (or bootstrap) if you dont want to. This is cool as we've been able to design all of easel inside of easel itself.
Collaboration: A very central part of the design process. You can share designs with your team, create clickable prototypes to test your ideas, and everyone invited can leave comments.
Our goal is to make easel awesome for all your web work in a professional team setting.
I'm stoked to try this out!