Teamviewer alternative for machines behind NAT with gray IP?

Question

VNC

Do not offer cross-platform solutions. Need MAC/WINDOWS
support Need an alternative Teamviewer that does not require any configuration (even behind double NAT and gray ip like yota and megaphone), got an ID and everything is already working so that even a single-cell user can install the program.
Do not offer VNC, those are still dancing with a tambourine, and as soon as the network settings have changed, reconfigure it again, and all this happens just then the conda should just work.

Answer 1

As a result, testing all possible software, I came to the conclusion that Anydesk (cross-platform) and Google Chrome with the official plug-in for remote access are the best so far.
All this software is not without jambs, but so far it is the best there is and free.

Answer 2

(Brynhildr + kitty + SSH + autoit forum.ru-board.com/topic.cgi?forum=5&topic=48024&s
...
AeroAdmin
https://www.aeroadmin.com/ru/
ZeroLab.NeT Viewer - Analog of TeamViewer (aspia )
https://zerolab.net/2018/05/27/zerolab-net-viewer-...
ChunkVNC
forum.ultravnc.info/viewtopic.php?f=50&t=33805&sid...
ULTRAVIEWER
https://ultraviewer. net/ru/download.html
AltVizor
https://altvizor.com/ru/
x11vnc+repeater (linux)
https://unixforum.org/viewtopic.php?t=138440

Answer 3

ZeroViewer - a program for remote user support
https://null.la

Answer 4

https://www.manageengine.com/remote-desktop-management/
there is a cloud (freebies included) version,
more precisely you here https://assist.zoho.com
there ala teamviewer crossplatform
and here is everything

Answer 5

+ LiteManager Free
https://www.litemanager.com