GrapesJS Presentation Engine
GrapesJS appears to be a very competent layout builder (take a look at the demo). I group this with other “presentation management” tools like ContentPepper and Netgen Layouts.
I find these tools interesting because they could serve as the front-end managers for backend content repositories, which could help with distributing a content infrastructure. Consider: how hard would it be to create a set of blocks that insert content or queries from a backing CMS in real-time?
Which begs the perennial question of headless: do our management and presentation tools have to live in the same system?