1.3. Is GNU Mailman free?
Yes. It is free in two senses: it costs nothing to download, install, or use. And it is Free Software, meaning you can change it and redistribute the changes, as long as you adhere to its license.
Mailman is part of the GNU Project, and is covered by the GNU General Public License. For details see:
The Free Software Foundation: http://www.fsf.org
The GNU Project: http://www.gnu.org/gnu/the-gnu-project.html
The GNU General Public License: http://www.gnu.org/licenses/gpl.html
The Mailman pages at gnu.org: http://www.gnu.org/directory/mailman.html
Converted from the Mailman FAQ Wizard
This is one of many Frequently Asked Questions.