Interesting, but doubt I'll use it as there aren't any filters for open source/ self hostable so most of it isn't relevant to me.

Likely stick to looking at things like

https://selfhosted.libhunt.com/ and
https://alternativeto.net/

https://www.reddit.com/r/selfhosted/ pretty useful too but I mostly forget about that one.

Saying that, I do also sometimes look at stuff like:

https://stackshare.io/collaboration
https://stackshare.io/business_tools

Just to see which tools are popular (and then look on the other sites to find open source and self hostable alternatives for them)