What is the analogue of TeamViewer for a computer behind NAT?

Question

teamviewer

You need to go to one computer often and 3 more - sometimes. I launch a portable, which in such conditions began to swear at commercial use.
Are there any analogues for use with devices on the provider's NAT? It is clear that the address is gray, port forwarding is not expected.

Answer 1

Ammyy

Answer 2

AMMYY Admin. For Windows, you can install through Chocolatey or so .