“Part of the problem is that open-source software is often
mistakenly confused with freeware. It’s true that many open-source
packages are free, but the two terms mean very different
things.”
“Freeware doesn’t provide access to source code, nor are users
authorized to modify the product without permission from the
author.”
“Definitions of open source vary somewhat, but in general,
it means that a program’s original source code must be freely
available to anyone who wants it. Stricter definitions state
that software can be called open source only if its license allows
users to redistribute the software at no charge — though they
don’t prohibit charging for support or consulting services.”