I need an example of a open source web application product line to do some analysis on the source code. specifically, i want to see how each member of the product line differs from the other in terms of source code. For example, what % of the code of product X Lite comes from product X Enterprise's code.
there are many open source php web applications (e.g. postnuke, phpnuke, phpbb etc.) but these are one-off products (not produt lines). so i cannot use them in my study. So i turn to PHP veterans who may have seen more of the PHP world than i have