The product and the website are really slick, but there is nothing about who made this other than "FormKit, Inc." in the footer. Is this a group, an individual, a subsidiary, or what?
One of the maintainers here — new business created by the team that made Vue Formulate (https://vueformulate.com/). FormKit is its own entity because its goals are larger than being a sub-product of a client-service agency.
GH contributions primarily from three people, all affiliated with https://www.wearebraid.com/home. Seems to be some web dev consultancy that has open sourced part of their toolchain.
Primary author is Justin Schroeder - https://twitter.com/jpschroeder
I help :) (Andrew Boyd) - https://twitter.com/0xBOYD