free software

According to Richard Stallman and the Free SoftwareFoundation, 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

use.

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".