Remote desktop tools for IT support: TigerVNC, TightVNC, NoMachine and the mRemoteNG connection manager.
TigerVNC is a free, open-source (GPL-2.0) VNC implementation: Xvnc gives Linux users their own virtual desktops, and the fast vncviewer runs on Windows, macOS and Linux with TLS encryption and SSH tunnelling support.
NoMachine is fast remote desktop software for Windows, macOS, Linux and Raspberry Pi, based on the NX protocol. Since version 10 it is shareware (conditionally free): the free edition was retired, the client-only Enterprise Client stays free.
TightVNC is a free (GPL-2.0) VNC server and viewer for Windows, also free for commercial use. The server runs as a service, deploys silently via MSI and supports file transfer. Traffic is not encrypted, so use it on a LAN, VPN or SSH tunnel.
mRemoteNG is a free, open-source tabbed remote connections manager for Windows. It keeps RDP, SSH, VNC, Telnet, HTTP and PowerShell sessions in one tree with folders, inherited settings and saved credentials, and opens each in a tab.
