RealVNC is a software consisting of a server and client application for the Virtual Network Computing (VNC) protocol to control another computer's screen remotely. Developed by RealVNC Limited
License: Free Personal
rdesktop is an open-source solution primarily focused on providing RDP support for Windows systems, making it lightweight and fast but limited in features. On the other hand, RealVNC is a more versatile remote access tool with a user-friendly interface and strong security features, making it suitable for various platforms but potentially slower in low bandwidth scenarios.