LibVNCServer/LibVNCClient are cross-platform C libraries
Qt based VNC viewer with MAME/MESS specific extensions
Various multi-platforms projects coded in FreePascal/Lazarus or Qt C++
100% Qt5 RFB VNC Client implementation
Remote File Browser
Light-weight RFB 3.8 (VNC) Server for Windows CE 5.0
Remote Desktop server/client (proprietary protocol) (written in java)