There is Gemini (the real gemini) and gopher, so far there is a lot of interesting items. Some Links:

gemini://gem.sdf.org/

gemini://sdf.org/

gemini://gemi.dev/

gemini://gemi.dev/cgi-bin/wp.cgi/

gemini://cdg.thegonz.net/infrastructure/search/

gemini://zaibatsu.circumlunar.space/~solderpunk/cia-world-factbook/

gemini://geminiprotocol.net/

gopher://sdf.org/1/

gopher://magical.fish/1/

gopher://gopherpedia.com/1/

gopher://gopher.floodgap.com/1/overbite