Firefox

Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, Mozilla Corporation. Firefox is officially available for Windows 7 or ...
Language(s): C++, JavaScript, HTML, C, Rust
Operating system(s): Linux, mac OS: OS X 10.9 or later, Windows 7 or later, Android Jelly Bean or later, iOS 11 or later, FreeBSD, OpenBSD, NetBSD, illumos, Solaris
License: Mozilla Public License (MPL) 2.0

FlightGear

FlightGear Flight Simulator (often shortened to FlightGear or FGFS) is a free, open source multi-platform flight simulator developed by the FlightGear project since 1997....
Language(s): C++, C
Operating system(s): Windows, Linux, Mac OS, FreeBSD, Solaris, IRIX
License: GNU General Public License

FreeCAD

FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changin...
Language(s): C++, Python
Operating system(s): Linux, Mac OS, Unix, Windows
License: GNU Lesser General Public License

FreeMat

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing. It is similar to commercial systems such as MATLAB from Mathworks, and IDL from Research Systems, bu...
Language(s): Assembly language, C, C++, Fortran, Qt
Operating system(s): Linux, Mac OS, Windows
License: GNU General Public License

FreeSWITCH

FreeSWITCH is designed to route and interconnect popular communication protocols using audio, video, text, or any other form of media. First released in January 2006, FreeSWITCH has grown to become th...
Language(s): C
Operating system(s): Linux, Mac OS, Solaris, FreeBSD, NetBSD, OpenBSD, DragonFly BSD, Windows
License: Mozilla Public License (MPL)