https://forum.uvnc.com/
Official UltraVNC git source
UltraVNC
UltraVNC Server, UltraVNC Viewer and UltraVNC SC | Official repository: https://github.com/ultravnc/UltraVNC
ultravnc
It is now integrated in main UltraVNC sourcecode: https://github.com/ultravnc/UltraVNC