Hi:
An important document that discusses the advantage of open source over closed source (or proprietory) system is
http://www.catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/ (by Eric Raymond) According to him, a bazaar like atmosphere where everything is kept open and "discussable" will give a better deal for everyone; is better than the hushed atmosphere of a cathedral (= a proprietory firm that guards its secrets).
In my small way I've been attempting to promote an open source movement in architecture since 1990. I believe one way to do it is to get to represent architecture in a very objective manner, so that the assessment can be done. I was fortunate to discover some mathematical principles because of which I could write a software for the early stage of design in architecture, called TAD Designer Lite. It is a BIM (Building Information Modeler) as per current terminologies. The difference with other BIM like Revit etc. and my software is that my software can easily handle the hazy initial stages of design also. TAD has a built in programming language called ARDELA (
Architectural Design Language) which is a variant of Prolog. Using ARDELA, it is possible to write routines to do various assessment as the design is developed.
I have successfully carried out energy analysis using my software with Bombay IIT (Dr. J.K.Nayak) The interface work was done using ARDELA. The paper for the research done by us is available at Amazon and TERI if someone is interested.
And I've started an "open source movement" that hopefully would address the issues pointed by Hara Narayan. The website at
http://www.teamtad.com is being built to handle it.
Regards