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

Flex

Flex is a free and open-source software alternative to lex. It is a computer program that generates lexical analyzers (also known as "scanners" or "lexers"). It is frequently used as the lex implement...
Language(s): C and C++
Operating system(s): Unix, Linux
License: BSD license

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

Foremost

Foremost is a console program to recover files based on their headers, footers, and internal data structures. This process is commonly referred to as data carving. Foremost can work on image files, su...
Language(s): C
Operating system(s): Linux
License: Public Domain (US Gov) Source code is available

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