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payload
Payload is the open-source, fullstack Next.js framework, giving you instant backend superpowers. Get a full TypeScript backend and admin panel instantly. Use Payload as a headless CMS or for building powerful applications.
We built Payload exactly for your use case! I had the same exact experiences and questions as you. It's 100% free, open source with MIT license and you can self-host it. We have a ton of features and are about to hit 1.0. We're getting a ton of traction right now.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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webiny-js
Open-source serverless enterprise CMS. Includes a headless CMS, page builder, form builder, and file manager. Easy to customize and expand. Deploys to AWS.
If you haven't already decided do take a look at Webiny (https://www.webiny.com), it's open source, very extensible and built on TypeScript. There are a ton of features already like internationalization, multi tenancy, a file manager (including storage mechanism to S3) and it's propagated on a CDN for faster API queries.