...TightVNC is: free for both personal and commercial usage, with full source code available, useful in administration, tech support, education, and for many other purposes, cross-platform, available for Windows and Unix, with Java client included, compatible with standard VNC software, conforming to RFB protocol specifications. With TightVNC, you can: cut your expenses and save your time on traveling, help your friends and family to solve problems with their computers remotely, make sure nothing wrong is happening on your computers when you are away. TightVNC is available under the terms of the GNU General Public License (usually referred to as GPL).