UltraVNC (sometimes written uVNC), an open-source remote-administration/remote-desktop-software utility for Microsoft Windows. Developed by UltraVNC
License: Open Source
Guacamole is a web-based remote desktop gateway that does not require any client installation, making it accessible from any device with a browser. In contrast, UltraVNC requires installation on the host machine and is optimized for high performance and file transfer capabilities.