The best alternative to TeamViewer is NoMachine, which is free. If that doesn't work for you, our users have ranked more than 50 alternatives to TeamViewer, but unfortunately only two of them are.
Access remote computers easily with enterprise-class speed and features supporting any content including audio and video.
It's free for personal use, even after so many years.
Respons is best even with GUI
X2Go is an open source remote desktop software for Linux that uses the NX technology protocol.
Very good if you're in Linux to Linux use cases.
Really awesome for Linux users to remotely connect to their computers through a secure connection. Allows for transmission of audio from the client, and works really well even with slow connections. To summarize: secure by default (because using ssh), good even in low latency, good for presentations, and best alternative to RDP for linux users.
Works remarkably good and it has sound as well.
Luxembourg
EU
Germany
Easy to use, install NoMachine on both computers. Connect to another computer via internet with external IP or services like dyndns, just need port forwarding. Very stable and many features.