Here are a few that are in the ball park, but mostly lacking the form bit (you have to make your own though most of these offer a way to have a append-only user

Here are a few that are in the ball park, but mostly lacking the form bit (you have to make your own though most of these offer a way to have a append-only user for the form to act as): - Strapi (https://github.com/strapi/strapi https://github.com/strapi/strapi) - Directus (https://github.com/directus/directus https://github.com/directus/directus) - React Admin (https://github.com/marmelab/react-admin https://github.com/marmelab/react-admin) - Netlify CMS - a bit off the mark but maybe worth considering (https://github.com/netlify/netlify-cms https://github.com/netlify/netlify-cms)