Is Redmine free for commercial use?

Yes, Redmine is free for commercial use. It is licensed under the GNU General Public License (GPL), which allows users to run, modify, and distribute the software without any licensing fees. This means you can use Redmine in a commercial setting, including offering it as a hosted service for a fee, as long as you comply with the terms of the GPL.

The GPL does require that if you modify the source code and distribute it, you must also make your modified version available under the same license. However, hosting Redmine as a service does not count as distribution, so you can charge users for access without needing to pay for a commercial license.