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

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)

GIMP

The Free & Open Source Image Editor This is the official website of the GNU Image Manipulation Program (GIMP). GIMP is a cross-platform image editor available for GNU/Linux, OS X, Windows and mo...
Language(s): C
Operating system(s): Linux, macOS, Microsoft Windows, BSD, Solaris
License: GNU GPL v3+

GNU Octave

GNU Octave is a Scientific Programming Language with powerful mathematics-oriented syntax with built-in plotting and visualization tools, Free software, runs on GNU/Linux, macOS, BSD, and Windows, and...
Language(s): C, C++, Fortran
Operating system(s): GNU/Linux, Mac OS, BSD, Windows
License: GNU GPLv3