ammyy.com - vnc + serverside port forwarder

ammyy.com vncviewer + vncserver and their server-side port forwarder that allows to connect to any screen irregarding of firewalls. They hacked up GPLed code of VNC and resell it under their own brand (i.e. they violate GPL!).

patch for vncviewer-win32 for correct entry of cyrillic

Vlad Kharchev's page
page with patch to vncviewer for windows that allows entry of cyrillic characters into any Xvnc
(page in russian), It has been created in 2001, but it applies to tightvnc 1.3.9 just fine.

s-code - libraries and tools for Windows

S-code VNC viewer and VNC server ActiveX controls (for WIndows) and VNC management tools (for Windows). Commercial.

ActveX-based page for accessing vnc server

Page with VNC viewer embedded into it (as ActiveX control) allows to access VNC server from Internet Explorer (Windows only) with the use of Active-X for free. Based on the VncViewer ActiveX control for the same company.
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j2meVNC - viewer for mobiles

j2meVNC
a free open-source remote desktop viewer for J2ME platform (supported by nearly all mobile phones).

TridiaVNC - dead

TridiaVNC the commercial distribution of VNC. Distribution and support of it has stopped in 2005.

PocketPC VNCViewer Client

PocketPC VNCViewer Client - a vnc viewer for pocketpc 2000-2003. Open-source, free.