X2Go is described as 'open source remote desktop software for Linux that uses the NX technology protocol' and is a popular app in the OS & Utilities category. There are more than 25 alternatives to X2Go for a variety of platforms, including Windows, Linux, Mac, Android and iPhone. The best alternative is TeamViewer. It's not free, so if you're looking for a free alternative, you could try Chrome Remote Desktop or DWService. Other great apps like X2Go are NoMachine (Freemium), MeshCentral (Free, Open Source), UltraViewer (Free Personal) and Remotely (Free, Open Source).
Xpra is 'screen for X': it allows you to run X programs, usually on a remote host, direct their display to your local machine, and then to disconnect from these programs and reconnect from the same or another machine, without losing any state.
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Xpra vs X2Go opinions
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Works great for running applications remotly. Very stable and fast.
Clientless RDP Server Manager. The Windows Server acts as a gateway, while the HTML5 web rdp client grants secure remote desktop without installing extensions nor plugins on the user side. Includes FTP, remote audio/printing, access profiles, etc.
SaaS Remote management: remote desktop, shell, process and file transfer. It has an small-sized agent which is run as a service. These agents connect to our servers so that you can connect to them from anywhere just with a browser. No firewalls/NAT.
The best open source remote desktop software. It is an alternative of TeamViewer and AnyDesk, but open source. You have full control of your data, no concern of security. You can use my rendezvous/relay server, or set up your own, or write your own rendezvous/relay server.
Simple web tool for fast remote desktop access. Support simultaneous access to few remote desktops. Web-based: Not need install app for person who initialise remote access. Remote access established via web-site page. Secure connection, 2fa support.
Seecreen, a word play of See Screen, is a remote desktop control and sharing application written in Java. It is multi platform (Windows/MacOS/Linux) and can work behind NAT and Firewall with zero configuration.