"On the one hand, open source developers want to find a
way to make money from their projects. On the other hand, many
application users, particularly enterprise users, are looking for
applications with fee-based support. Rightly or wrongly, they feel
that paying a fee brings greater accountability, and often these
users lack the skills to manage open source apps on their own and
would rather pay someone else to do it.
"With pressure from both sides, it's no wonder that so many open
source security applications now have commercial components. In
all, we’ve covered 26 open source applications that have
fee-based support available in some form.
"It's also worth noting that the revenue models for that
fee-based support vary substantially from project to project. Our
list includes subscription-based services where users pay a yearly
or monthly fee for access to e-mail or telephone assistance, as
well as "open core" products, which are based on open source
projects but incorporate additional features."