Static websites are web pages with fixed content and its constant. But now static sites also handle dynamic data using APIs and queries.
Applications that provide data for frontend through REST API are backend applications. Some of the free hosting providers for your backend were also mentioned below.
Hosting all these applications to cloud for the public access to prototype our idea, showing to friends, colleagues, reach audience during development needs someplace to host and we can't afford high hosting prices during prototype or in development.
Here's the list of free application hosting providers,
Github Pages - https://pages.github.com
Hosted directly from your GitHub repository. Just edit, push, and your changes are live.
Netlify - https://www.netlify.com
Easy deploy by dropping your site folder or link your repository for auto-build and auto-publish on commit.
Vercel - https://vercel.com
Host static sites, JAMstack, and auto-deploy on commit.
Render - https://render.com
In Render, we can host static sites and also backend part (adds pricing). Also, auto builds and publishes from a commit.
Surge - https://surge.sh
Simple, single-command web publishing. Publish HTML, CSS, and JS for free, without leaving the command line.
Tiiny Host - https://tiiny.host
The simplest way to publish your website.
Fast - https://fast.io
Host anything like images, documents, and files. Global content delivery network free for personal projects.
Heroku - https://www.heroku.com
The cloud service provider offers up to 500 MB of hosting storage for personal projects and we can host all kinds of applications.
Amazon S3 - https://aws.amazon.com/s3
It provides static site hosting with objects stored in it. It's free for a limited amount of requests and also based on CRUD operation on objects. Check their site for full information.
Similar to AWS, azure and google cloud provides site hosting services. Check documentation for the free pricing limit.
Firebase - https://firebase.google.com/docs/hosting
The above list is only a few service providers and you guys feel free to add more to this that you used recently.
Disclaimer: I am not promoting any of these services. Please go through the website to learn more about their services.