Federation Against Software Theft(FAST) is a non-profit organisation, formed in 1984 by the software industry with the aim of eradicating software theft in the UK. In addition to prosecuting organisations and individuals for software theft, FAST set up a campaign of public education and awareness to ensure that users of commercial software understand the effects of software theft. FAST gives a member organisation, which has signed a Code of Ethics and is committed to the carrying out of a regular software audit, a period of grace before bringing action if there is evidence of irregularities by the member organisation.

A fat binary, also known as multiarchitecture binary, is a computer program that is native to multiple instruction set architectures (ISA) and thus can be run on multiple processor types. The usual method of implementation is to include a version of the machine code for each ISA, resulting in a file n times larger than a normal one-architecture binary.

Fetch-and-add CPU instruction is a special instruction that automatically modifies the contents of a memory location. It is used to implement Mutual exclusion and concurrent algorithms in multiprocessor systems.

In mathematics, the Fibonacci numbers is a sequence of numbers defined recursively by the Fibonacci rule: after two starting values, each number is the sum of the two numbers before it. For example, the first Fibonacci numbers for n = 0, 1, 2, 3, … are 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, …

Filename extension is a portion of a filename, following the point after the individual file name. Filename extenson indicates the type of data stored in the file. Many operating systems use filename extensions, e.g. Unix,MS-DOS. Examples include "c" for C source code, "doc" for Miscrosft word, "ps" for PostScript, "txt" for text fle, etc.

Firefox, also known as Mozilla Firefox, is a free, open source, cross-platform, graphical web browser developed by the Mozilla Corporation and hundreds of volunteers. Firefox includes an integrated pop-up blocker, tabbed browsing, live bookmarks, support for open standards, and an extension mechanism for adding functionality. Although other browsers have some of these features, Firefox became the first such browser to include them all and achieve wide adoption.

Free Lossless Audio Codec (FLAC) is a popular free audio compression codec that is lossless. Unlike lossy codecs such as MP3 and AAC, it does not remove any information from the audio stream and is suitable both for everyday playback and for archiving audio collections. "Free" means that the specification of the stream format can be implemented by anyone without prior permission, and that neither the FLAC format nor any of the implemented encoding/decoding methods is covered by any patent. The sources for libFLAC and libFLAC++ are available under Xiph.org's BSD license and the sources for flac, metaflac, and the plugins are available under the GPL.

Full motion video (FMV) is a popular term for pre-recorded TV-quality movie or animation in a video game. FMV is simply a playback of something that was previously recorded. With modern computer hardware, games are rendered at much higher resolutions than typical FMVs, resulting in FMVs being easily spottable as "lower quality" than the game itself. In this case, while a pre-rendered FMV may use more advanced effects than possible in-game, it is considered lower quality due to being seen at a lower resolution.

FORTRAN is the oldest high-level programming language, designed by John Backus for IBM in the late 1950s. FORTRAN is a general-purpose, procedural, imperative programming language that is especially suited to numeric computation and scientific computing. It is still in use today, particularly for scientific applications that require extensive mathematical computations. The two most common versions of FORTRAN are FORTRAN IV and FORTRAN 77. A new ISO and ANSI standard for FORTRAN, called FORTRAN-90, was developed in the early 90s.

The Fourier Transform, named after Joseph Fourier, is an integral transform that re-expresses a function in terms of sinusoidal basis functions, i.e. as a sum or integral of sinusoidal functions multiplied by some coefficients ("amplitudes"). Fourier Transform technique is used to evaluate the importance of various frequency cycles in a time series pattern.

Function point analysis (FPA) is a method used to gauge the size and complexity of computer software, employing a function point as a unit of measure. Function points are a unit measure for software size, much like an hour is to measure time.

Free software license refers to a license which grants permissions to the recipient to remove any ownership issues which would otherwise prevent the software from being free software. With free software license, recipients of the software is granted the freedom to modify and redistribute the software by the copyright holder.