Delightful Dude

I understand! I know there is a lot of hype about Discord, especially young people love it. Despite all the features, isn’t Discord just a chat software? Reading your answer, I think you are looking for a forum software (not chat) 😄 Have you looked at Discourse? It is open source, offers a modern, hierarchical structure with categories and subcategories, extensive permission systems and role management. It is specifically designed for larger communities and allows easy management of moderators and admins.

Matrix is horrible for large communities

Interesting, what issues did you have? How large are those communities?

The best image gallery software is Nextcloud Memories.

Have you tried searxng? Just switch them on in the settings:

Voilá: https://www.spacefun.ch/icefun

Great! Finamp is my daily driver!

Well done! Great font! Is this scientifica?