Mike Pelletier recently sent a great email out to the plone-users list:

CaseWare International is working on a number of Plone products and enhancements.  They are all intended to be released under the GPL. 

We presently have four full-time developers on our "OpenEngagement" project, and several more working on Plone projects for clients. 

We are interested in coordinating development with other developers to reduce wasted effort.  I would like to take the list on a brief tour of our open and future projects.

If you have a libre project similar to one of ours and would like to reach your goals sooner, or if you can get value from one of our projects and want to see it released sooner, please get in touch...

What then followed as a tour-de-force of great Plone product ideas, some with code, and some just conceptual.

Regardless, it is great to see add-on Product developers taking this kind of initiative to start conversations about collaboration BEFORE writing and releasing code.