I've been into the idea of JAMstack lately. In fact, it was at the inaugural JAMstack_conf that I gave a talked called The All-Powerful Font-End Developer. My overall point there was that there are all these services that we can leverage as front-end developers to build complete websites without needing much help from other disciplines — if any at all.
Sometimes, the services we reach for these days are modern and fancy, like a real-time database solution with authentication capabilities. And sometimes those services help process forms. Speaking of which, a big thanks to Wufoo for so successfully being there for us front-end developers for so many years. Wufoo was one of my first tastes of being a powerful front-end developer. I can build and design a complex form super fast on Wufoo and integrate it onto any site in minutes. I've done it literally hundreds of times, including here on CSS-Tricks.
Another thing that I love about building Wufoo forms is that they travel so well. I use them all the time on my WordPress sites because I can copy and paste the embed code right onto any page. But say I moved that site off of traditional WordPress and onto something more JAMstacky (maybe even a static site that hits the WordPress API, whatevs). I could still simply embed my Wufoo form. A Wufoo form can literally be put on any type of site, which is awesome since you lose no data and don't change the experience at all when making a big move.
And, just in case you didn't know, Wufoo has robust read and write APIs, so Wufoo really can come with you wherever you go.