I’ve come across this site a few times when browsing reddit: https://discordless.com
It compares alternatives to Discord with their features, pros and cons.
The list is hardcoded and Discourse is shown 2nd, which is a good thing if this site gains popularity.
The website is being rebuilt, so I don’t know if the default order will remain the same. I tried running the development version locally with no success (probably because it’s in development, duh).
edit: ah, the site has been rebuilt today. Discourse is no longer emphasized on the front page.
It is still 2nd when we click on “User Base” tho.
Also listed here: https://discordless.com/alternatives