Is there a free alternative to Google Sites that’s open source? I want one with free custom domains, not subdomains.
https://neocities.org/ might work for you.
Forget about free domains if you want to do something remotely serious with them. A real domain is few dollars/year and AFAIK you could use it coupled with GitHub Pages for simple, static websites or with altervista.org if you need WordPress.
You want a website? https://wordpress.org/ is open source
Yes, but it’s a script you install on a web server. I want a builder that’s similar to Google Sites.
what about wordpress.com ? (yeah, it’s different but by the same developers)
basic plan is free, yup. iirc you have to pay to ‘bring your own domain’ (vs using a subdomain off theirs’)
Domain registrations are not free. It’s an annual fee, I don’t think any company will give those out for free. I can recommend using https://www.namecheap.com/ for domain registrations.