Gemini is a new internet protocol which:

• is heavier than gopher
• is lighter than the web
• will not replace either
• strives for maximum power to weight ratio
• takes user privacy very seriously

You can read more about it here: https://gemini.circumlunar.space/

I've created a server implementation, see more details here Gemini-PHP

I have a Gemini server running at gemini://glasgow.social