TurboVNC 3.1.4

TurboVNC is a performance-oriented version of the VNC remote desktop connection protocol, based on TightVNC, x4vnc, TigerVNC, and X.org. It provides 3D rendering and VirtualGL compression, works well on video and image-intensive connections. It remains fully compatible to other implementations, but often requires less than a fifth processing power. A Java-based VNC viewer is also available

FreeRDP 3.9.0

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Enjoy the freedom of using your software wherever you want, the way you want it, in a world where interoperability can finally liberate your computing experience.

Remmina 1.4.36

Use other desktops remotely, from a tiny screen or large monitors. RDP, VNC, SPICE, X2Go, SSH, WWW (HTTP protocol) and EXEC network protocols are supported. Written in GTK, with a port to Qt underway. Released as "remmina" (the main program) and "remmina-plugins".

Apache Guacamole 1.5.5

Apache Guacamole is a clientless remote desktop gateway. It supports standard protocols like VNC, RDP, and SSH. We call it clientless because no plugins or client software are required. Thanks to HTML5, once Guacamole is installed on a server, all you need to access your desktops is a web browser.

KRDC 24.02.0

KRDC is a client application that allows you to view or even control the desktop session on another machine that is running a compatible server. VNC and RDP is supported.