Originally Posted by csn-uk
The idea is there, and there are a few that are about although the only problem I can see with open source is security and support, even though many applications such as joomla pull it off well, the addition of community modules can be very “dangerous” although it does depend on how open you intend the project to be, for example community development vs closed development.
That would be my only reservation over say choosing whmcs or another system that is already well rounded. Although that said there will always be security holes in any piece of code/software/script just really depends on how determined someone is to gain access.
If you've ever stopped by the WHMCS forums and noticed all the contributions, and members willing to advance feature development you'll understand the outcome if they were actually given access to the source.
There's just the licensing/security issues, which CAN be sorted out.