** The Nielsen – Schreier theorem, that every subgroup of a free group is free.

** Carefree means " free from care or anxiety.

** Carefree means ' free from care or anxiety '.

** Mini Zork I: The Great Underground Empire ( 1987, Marc Blank & Dave Lebling, free cut-down, single load tape version of game, covermounted on UK's ZZAP! 64 magazine )

** Freeview digital free satellite with a dozen SD channels, with SD feeds of the terrestrial HD freeview channels.

** Sex drive is dependent on androgen levels only in the presence of estrogen, but without estrogen, free testosterone level actually decreases sexual desire ( instead of increases sex drive ), as demonstrated for those women who have hypoactive sexual desire disorder, and the sexual desire in these women can be restored by administration of estrogen ( using oral contraceptive ).

** the free product of groups

** Webs ( web hosting ), a website which allows users to create free websites

** Raid at Cabanatuan: 121 American soldiers and 800 Filipino guerrillas free 813 American POWs from the Japanese-held camp at Cabanatuan City, Philippines.

** Cold War: East Germany holds its first free elections.

** Gulf War: The United Nations Security Council passes UN Security Council Resolution 678, authorizing military intervention in Iraq if that nation does not withdraw its forces from Kuwait and free all foreign hostages by Tuesday, January 15, 1991.

** Entebbe Raid: Israeli airborne commandos free 103 hostages being held by Palestinian hijackers of an Air France plane at Uganda's Entebbe Airport ; 1 Israeli soldier and several Ugandan soldiers are killed in the raid.

** The first free parliamentary elections are held in Poland.

** Kidnappers in Lebanon set Anglican Church envoys Terry Waite and Thomas Sutherland free.

** First free flight of Igor Sikorsky's Vought-Sikorsky VS-300 helicopter.

** Vietnam War – Operation Ivory Coast: A joint Air Force and Army team raids the Son Tay prison camp in an attempt to free American POWs thought to be held there ( no Americans are killed, but the prisoners have already moved to another camp ; all U. S. POWs are moved to a handful of central prison complexes as a result of this raid ).

** In Chipping Norton, England rioters attempt to free the Ascott Martyrs – sixteen women sentenced to imprisonment for attempting to dissuade strikebreakers.

** The Soviet manned space mission Soyuz 18a ends in failure during its ascent into orbit when a critical malfunction occurs in the second and third stages of the booster rocket during staging, resulting with the cosmonauts and their Soyuz spacecraft having to be ripped free from the vehicle.

** Brazil holds the second round of its first free election in 29 years ; Fernando Collor de Mello wins.

** Richard Stallman, American free software proponent

** 86 free African American colonists sail from New York City to Freetown, Sierra Leone.

** The Dutch were for free trade, while industries in Belgium called for the protection of tariffs.

** admitted California as a free state

** Software bug, a software defect

** Hardware bug, a defect in hardware, often with close affinity to software

** The Nintendo 3DS is backward compatible with most of the Nintendo DS and Nintendo DSi software.

** The Xbox 360 is backward compatible with some Xbox games via software emulation.

** Commodore Plus / 4, a home / personal computer featuring standard office software applications built-in, released in 1984

** Architectural pattern, a standard solution to architectural problems in software engineering.

** implementing an interface for non-driver software ( e. g. TWAIN )

** Extension ( Mac OS ), particular type of this software

** FIPS Mode, software based on Network Security Services complying with FIPS 140

** Filter ( software ), a computer program to process a data stream

** Software metrics, a measure of some property of a piece of software or its specifications

** Pipeline ( software ), a chain of processes or other data processing entities

** Pipeline ( software ), a chain of data-processing processes or other software entities

** Web browser engine, software that takes information and displays the formatted content on the screen

** RRDTool, a widely used tabulating and graphing software

** Scream Tracker music tracker software

** A software suite, or collection of related application or utility software

** A software library

** Dave Cutler, American software engineer

** Martin Luther King Day Crash-Telephone service in Atlanta, St. Louis, and Detroit, including 9-1-1 service, goes down for nine hours, due to an AT & T software bug.

** Jack Dorsey, American software architect, businessman, creator of Twitter

** Telephone service goes down in the cities of Washington DC, Pittsburgh, Los Angeles and San Francisco due to a software bug.

** The name " Micro-soft " ( for microcomputer software ) is used by Bill Gates in a letter to Paul Allen for the first time ( Microsoft becomes a registered trademark on November 26, 1976 ).