GrapesJS is the forever OG that proved this whole space could be an embeddable SDK rather than a paywalled SaaS. It also standardized the palette/canvas/inspector layout that every serious visual builder now ships by default — including Templatical. I took direct inspiration from a few other patterns too: the block-as-first-class-citizen model, and the trait system, which maps almost 1:1 to how Templatical's custom blocks expose typed fields into the inspector.

And yeah — agreed on MJML. Building email layouts that work for most clients is notoriously hard. I think the people who built MJML absorbed an enormous amount of pain so the rest of us don't have to.

Huge respect for what you built.