Alright, I’ll go first. I’m (To)biased, and obviously https://meta.discourse.org is my favorite Discourse site! It’s the first Discourse site I joined and I have been continuously active here since 2014. I love hanging out with my friends and fellow Discourse afficionados here, many who have also been here for many years. I also really like how the team is open to good suggestions and it always gives me a boost when ideas I suggested or contributed to improving make it into our software.
Two other sites I visit daily are private, member only communities. One is for my extended family where I enjoy sharing links and stories, and collaborating on projects. It’s amazing how that site has become my memory for when I need to recall when I last changed the water filter or where we went on holiday in 2022.
The other is a site I set up for my local neighborhood, migrated many years ago from a yahoo group I created way back before I even knew about Discourse. That site gives me great comfort because I can always use it to reach out to neighbors when one of my cats goes missing or if I need help with something and will always know that helpful neighbors will quickly respond. It’s become a lifeline for me and everyone in my local community.
There are more sites I’m involved in but I’ll leave it here for now and see what others come up with!