Accessing a remote desktop computer is made possible by the remote desktop protocol (RDP), a proprietary protocol developed by Microsoft. It gives a user a graphical interface to connect to another/remote computer over a network connection. FreeRDP is a free implementation of the RDP.
RDP works in a client/server model, where the remote computer must have RDP server software installed and running, and a user employs RDP client software to connect to it, to manage the remote desktop computer.
In this article, they share a list of software (not all open source) for accessing a remote Linux desktop: the list starts off with VNC applications.
VNC (Virtual Network Computing) is a server-client protocol that allows user accounts to remotely connect and control a distant system by using the resources provided by the Graphical User Interface (GUI).
See https://www.tecmint.com/best-remote-linux-desktop-sharing-software/
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