Shameless plug but I designed and wrote something for doing this from 2011 to 2015 because nothing like it existed or indeed exists as far as I'm aware. It's a

Shameless plug but I designed and wrote something for doing this from 2011 to 2015 because nothing like it existed or indeed exists as far as I'm aware. It's a p2p caching proxy that also lets you edit web pages collaboratively in realtime over a LAN or the internet. It has a contacts list system and p2p chat functionality. This project effectively died due to lack of interest and I still have various security concerns about it (Should you break/reimplement Same-Origin policy or break/reimplement the TLS chain of trust?) The main security concern is that because it decentralises HTTP in-place (existing URLs can now be looked up on an arbitrary number of overlay networks if the original URL isn't providing an OK response) it puts users at risk of malicious actors spamming overlay networks with browser exploits for popular resources like "news.ycombinator.com/". I hope TBL and co converge on satisfying answers to these problems or constrain their design to not bother with decentralising existing URLs in-situ. Code lives here: https://github.com/Psybernetics/Synchrony https://github.com/Psybernetics/Synchrony Feel free to shoot me any questions.