From John:
So convinced was I of the potential of the Internet as a means of global unregulated person-to-person communication that I spent the better part of three years developing Speak Freely for Unix and Windows, a free (public domain) Internet telephone with military-grade encryption. Why did I do it? Because I believed that a world in which anybody with Internet access could talk to anybody else so equipped in total privacy and at a fraction of the cost of a telephone call would be a better place to live than a world without such communication.
This is freaky. There is another polymath John Walker who dabbled in VOIP: