UltraVNC viewer is a Windows client with file transfer and in-session text chat when connected to the UltraVNC server. UltraVNC source code (accessed 5 October 2026).
What it provides
The download page offers Windows builds; the separate embedded JavaViewer is served by the UltraVNC server for systems with Java. UltraVNC README (accessed 5 October 2026).
What you must provide
Install viewer updates from uvnc.com. UltraVNC downloads (accessed 5 October 2026).