If you already have Nextcloud running you can use the Nextcloud Forms app

I think Cryptpad has a good forms builder. Try it here (official instance)

Baserow and n8n both have form builders built-in, so if you’re using one of these tools already it might be worth checking out.

Budibase.

Lime Survey. I needed a self hosted solution and after a long search and evaluating a lot of alternatives, finally settled on this because a lot of advanced features were needed.

Pros: all possible features that you could need and a lot more. Admin interface is very powerful. Easy to install, extend. Cons: PHP. Complicated (as it’ has a lot of options). Scripting language is a pain in the butt.

i’m using mautic.

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