Personal computers have been around long enough that many of us have fond memories of a formative device, a technology, or an operating system. Some of us collect obsolete hardware; others recall the history because they were a part of making it.

Stephen Hackett and Larry Skutchan

Affordable refreshable Braille display

APH software to assist blind travelers navigate uncontrolled street crossings.

This link didn't come up on the show, but it appeared in response to a search, so I've included it for your futuristic pleasure.

Pre-Relay episodes of Parallel