Very easy: Free replacement to Teamviewer

Tuntox is a program which forwards TCP connections over the Tox protocol. This allows low-latency access to distant machines behind a NAT you can't control or with a dynamic IP address.

Tuntox is a single binary which may run in client mode or server mode. As a rule of thumb, run the server on the remote machine you want to access and the client on your local computer from which you want to access the server.

Tuntox is in early work in progress stage. It won't kill your goats but it may segfault, leak memory or have security issues (although I tried to make it rather secure). It won't be as fast as it could be because of the tremendous amount of debug output.

If you don't know what Tox is - it's an instant messenger protocol which is fully P2P, supports audio/video calls and file transfers. Unlike Skype it's fully open and unlike, say, XMPP - the calls and file transfers actually work. Go download a client from http://utox.org/ or read more at https://tox.chat/.

Read more in https://github.com/gjedeer/tuntox/

Regards