Lots of Gemini URLs scraped from mailing lists
I especially like Emacs elpher, I guess because I like Emacs.
Gemini Archive (from late 2020)
About Gemini Atom feeds:
Added RSS to my .gmi to .html script
A script to interleave tiny Gemini logs
GemPub (e-book publication using the gemtext format)
Spartan protocol. It doesn't use TLS but allows for data upload.
However, things like chatrooms are possible in Gemini: