|free software - According to Richard Stallman and the Free Software Foundation, free software is software that everyone is free
to copy, redistribute and modify. That implies it must be
available as source code. It does not imply that it is free
of charge, so anyone can sell free software so long as they
don't impose any new restrictions on its redistribution or
This dictionary is free in this sense, though it is not really software.
There are many other kinds of "free software" in the more obvious sense of "free of charge". See "-ware".