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Nginx Proxy Manager
Docker container for managing Nginx proxy hosts with a simple, powerful interface
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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.
The biggest pain point here are acme.sh and Let's Encrypt, as the API is free but it's very rate-limited, so you need to use the sandbox environment for developing/testing and switch between them and production when working on it. Plus, you also have to take care of the certificate's auto-renewal date and process, and set up the environment variables in CloudFlare and the VPS for logging in and updating some TXT records.
All you need is a cheap VPS with decent transfer allowance (RAM and CPU doesn't matter much) and this