"The Living Universe Foundation is a grass roots movement for the development of ecologically sound technologies for healing the Earth and colonizing the oceans and space. This ring is open to all members of the foundation, or any website dedicated to science, technologies, projects, or societies interested in ocean and space colonization."
I started the LUF (Back then, the FMF) Ring around 1997. It's still live and kicking. You can use it to explore other sites (next | prev | random | hub) or add your site and join in!