Free Software Implementations
A GNU version of m4 exists. FreeBSD, NetBSD, and OpenBSD also provide independent implementations of the m4 language. Furthermore, the Heirloom Project Development Tools includes a free version of the m4 language, derived from OpenSolaris.
Read more about this topic: M4 (computer Language)
Famous quotes containing the word free:
“No one can be perfectly free till all are free; no one can be perfectly moral till all are moral; no one can be perfectly happy till all are happy.”
—Herbert Spencer (1820–1903)