Open-source....Man, how this term has been buzzing in people's ears since Linux, Mozilla, and quite a few other phenoms first entered onto the computer scene within the last decade or more.
Basically, the term itself says it all: the allowance for developer wannabes who, mind you, have the skill, tact, and resources to have their way with the development of a particular computer feature, be it a simple application, script, plugin, extension, or maybe an *entire* operating system. Or, if the guy or gal is *that* ambitious, he/she can use the source code (which has been posted for all the world to gaze upon in awe) as the basis for the creation of a whole 'nother feature of his/her own (or, even better, his/her fellow developers).
It doesn't rely that much on money, and it doesn't usually use money as a linchpin for further development. In fact, with the further decrease (and, in many circles, decrying) of the importance of proprietary rights, money will sooner or later be thankfully pha