A lot of great tools, most of them free software, are used in this project:

• GTK of course...
• The compiler GNU Fortran (gfortran) and the Intel® Fortran Compiler (ifx).
• Scripting languages: Python, Perl, GNU Bash.
  • To test regular expressions: regexxer. See also the Pythex online Python regular expression editor.
  • Code checkers: Pylint, ShellCheck.
• git, the fast version control system.
• CMake, the cross-platform, open-source build system.
• GNU Make, pkg-config.
• fpm, the Fortran Package Manager.
• PLplot.
• VirtualBox with OSBoxes virtual machines.
• Linux Ubuntu, Fedora, FreeBSD...
• MSYS2 and Windows, macOS.
• Meld: a visual diff and merge tool.
• Scrot: a command line screen capturing tool.
• The video tutorial was made using recordMyDesktop, Kdenlive and eSpeak NG with a MBROLA voice.
• The Diátaxis framework to organize the wiki documentation.