Here are numerous free, open-source software packages that can be used to make your masterpieces. Each of them is provided by terms in the GNU General Public License. They are also offered here with absolutely no warranty. The world of FOSS (free and open-source software) can be wild and woolly – some things may work, some may not. FOSS changes rapidly, and these live links can be used to check for updates and patches. Some commercial solutions are listed as they have free trials you can test.
Furthermore, this material is broken down into these sections: