“Create P2P tunnels instantly that bypass any network, firewall, NAT restrictions and expose your local network to the internet securely, no Dynamic DNS required.”
There’s more information about the components of this system here:
There really isn’t much to this Holesail project - it’s a little convenience wrapper around Hyper DHT and that’s a part of this Pear project it seems. That site has a list of the various components and links to each one’s GitHub.
Pear looks like an interesting project but I haven’t looked through the details of how it works.