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Directus
The Modern Data Stack 🐰 — Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
However, you can use Firebase for free. Firebase is a BaaS and offers a pretty generous free tier for hosting, database, etc. There are a few CMS options for Firebase. For my current portfolio, I use FireCMS to manage all the content on my site. After the content is updated in FireCMS, my frontend will retrieve the new data making it super easy to publish new content.
A CMS will require a database for text content and usually some type of object storage (such as an S3 bucket) for image content. For my production projects, I usually use a self hosted version of Directus with a kinda complex backend on Kubernetes.