It is free software licensed under the GPL.

Slirp is free software licensed under a BSD-like license by its original author.

The first version was free software, licensed under GPL.

Graphviz is free software licensed under the Eclipse Public License.

The platform, along with the official modules, are Free software, licensed under the GPLv3.

The GA toolkit is free software, licensed under a self-made license.

The releases prior to version 4.23 are free software licensed under GPL.

Careware (also called charityware, helpware, or goodware) is software licensed in a way that benefits a charity.

Cygwin/X is free software, licensed under the X11 License.

The program is free software, licensed under the Gplv3.