Is there a good Page Builder I can implement in my web app?

I've been working on a small SaaS called My Cosplace, and part of the feature-set is the ability to easily setup a virtual portfolio (single page photo gallery with social links). I built a crude Page Builder UI with a few basic templates I created.

However, the page build itself isn't really the focus of the product, and isn't necessarily the selling point. Instead of spending hours building a better UX for the page builder, I'd rather use existing tech that is focused on that specific ability. I don't need it white labeled or anything, as I'm not trying to just sell another page builder. But, I need it to be something I can embed/implement within my app's UI, so that users aren't redirected somewhere causing confusion.

My user base is comprised of a mix of tech and non-tech people, so it needs to be something that isn't overwhelming to a non-tech person. Restrictive is fine (e.g. adjust text/color/images of existing template), and starting from a blank page building the entire thing yourself is a plus, but not necessary.

For reference, I'd love for it to be something similar to Carrd's experience, but that's just a preference, not a hard need.

I found https://beefree.io/, and it seems to be the general idea of what I want. I wasn't too happy with it after trying it out in my app, but it's the right concept.

I was wondering if there's anything else out there like this?