DistCities is a very simple distributed website sharing platform.
Just type or paste in some HTML, click seed, and share!
Your webpage will be available as long as at least 1 person has it open.
Pages are stored in cache, so unseeded pages can often be re-opened.
Disclaimer: This software offers no privacy. Arbitrary people can see the IP you use to seed and access pages. This is a P2P system. Your bandwidth is shared.