Now approved and in the marketplace, Form Reform is a new form building system for v8 and v9 that re-thinks the way you build forms in Concrete CMS. Form Reform - Concrete CMS
Each input type is a Concrete CMS block. You can design and layout forms as you would any arrangement of blocks in a page.
When a form is submitted, processing is managed through a fully configurable processing pipeline.
Form Reform is easy to adapt and extend by developers and agencies. Create a new template for an input block, add a new type of input block or add a new handler class for a new processing pipeline action.
I could write more, but I would only be repeating what is already provided by the extensive documentation and example forms at https://c5magic.co.uk/addons/form-reform. Also watch a 15-minute YouTube video: