Is there any free Vpn service that is online?

I want it to operate similar to hamachi, except I don't want to have to download anything. I want to be able to host a lan world on minecraft and play with friends over the Internet. I also want to be able to share a folded that they can access. Same with them to me. If they host a lan world or share a folder, I want everybody connect to be able to access it. Is there such website?

Virtual Private Network