(Back then, ham radio software was also consistently proprietary payware - in an area where every participant would have benefited so much more from an open source approach, as you could expect actual contributions - and software-defined radio was the devil, at least that was the impression I got.)
As for open source, this was probably the original open source. Lots of people build their own radios and still do and publish the designs for nothing. There are technical journals such as Sprat which cover this on old fashioned paper form. Software is mostly open now from what I have seen. Main tool these days for digital modes is a good example http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html - some people are using this with home build SSB transceivers and computer interfaces.