Emacspeak

Emacspeak is a speech interface that allows visually impaired users to interact independently and efficiently with the computer. Audio formatting --a technique pioneered by AsTeR-- and full support fo...
Language(s): C, Emacs Lisp, Tcl
Operating system(s): Linux, Mac OS, Unix, Windows
License: GNU General Public License

FFmpeg

A complete, cross-platform solution to record, convert and stream audio and video. FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handli...
Language(s): C and Assembly
Operating system(s): Windows, Mac OS, Linux
License: Open source software (Lesser GNU Public License) Portions are under “Dr.DivX DLL EULA” (Freeware)

Festival Speech Synthesis System

Festival offers a general framework for building speech synthesis systems as well as including examples of various modules. As a whole it offers full text to speech through a number APIs: from shell l...
Language(s): C++
Operating system(s): Linux, Mac OS, Unix, Windows
License: MIT License

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