Bubble/BBS - Another Gemini-only microblogging platform, but with Lemmy-style communities. This can be self-hosted, but is not federated. This also supports image uploads through Titan, which is only supported by Lagrange at the moment (as well as standalone Titan clients).
Tootik - A part of the fediverse. This is a very small instance (~2 active users), but it’s nice enough. Federation can be a bit hit-and-miss, especially with services like Misskey, but I blame that on the lack of activity.
Gemi.dev Heavy Industries - This capsule has a bunch of useful services and fun programs, including interactive games.
Auragem - Another capsule with some fun stuff. This is also where the Scroll protocol is being developed.
Gopherpedia - A frontend for Wikipedia, over the Gopher protocol.
04dco’s Gopher Hole - A pretty big Gopher hole with loads of random files. Not necessarily useful, but quite interesting to browse.
Can’t point you towards any lists, I’m afraid. However, I can list a few interesting places: