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Free surface effect
The free surface effect is the loss of a ship's initial stability caused by liquid that shifts toward the low side in a partially filled tank as the vessel heels.
Free-electron laser
A free-electron laser (FEL) is a device that generates intense, tunable coherent radiation from free electrons moving through an undulator, first operated at Stanford in 1976.
Free-flow speed
Free-flow speed (FFS) is the speed vehicles travel when unaffected by other vehicles, traffic control, or surrounding conditions, and it anchors capacity and level-of-service analysis in traffic engineering.
Free-space optical communication
Free-space optical communication, also called laser communications or lasercom, transmits data wirelessly by modulating a laser beam through air or vacuum, offering far higher bandwidth than radio.
Free-space path loss
Free-space path loss, or free space loss, is the signal strength loss of a radio wave traveling a direct line-of-sight path through free space, with no obstacles or reflections.
Free-space quantum key distribution
Free-space quantum key distribution, or free-space QKD, sends quantum encryption keys through open-air optical channels such as ground line-of-sight paths and satellite-to-ground links instead of optical fiber.
Free-to-air
Free-to-air (FTA) is a broadcasting term for television or radio services delivered without a subscription fee, funded by advertising or license fees; encrypted signals with free decryption keys also count.
Freebase (knowledge base)
Freebase was a large, collaboratively created graph database of general human knowledge developed by Metaweb, which Google acquired in 2010 and shut down in 2016.
Freeboard (hydrology)
Freeboard in hydrology is the vertical distance between the design water surface and the top of a dam, levee, or channel, kept as a margin against uncertainty.
FreeBSD
FreeBSD is a free and open-source Unix-like operating system descended from the BSD releases of the University of California, Berkeley, first released in 1993 and developed as a unified base system.
FreeCAD
FreeCAD is a free and open-source parametric 3D computer-aided design modeler for Windows, macOS, and Linux, started in 2002 and reaching version 1.0 in 2024.
Freedom 251
The Freedom 251 was an Android smartphone announced in 2016 by Ringing Bells, a Noida company, at Rs 251, which would have made it the cheapest smartphone ever sold.
Freedom EVO
Freedom EVO is a series of modular automated liquid handling workstations made by Tecan of Switzerland, launched in 2003 for genomics, proteomics, drug discovery, and diagnostics.
Freedom Fuel
Freedom Fuel, also known as Freedom Fuel Network, is a chain of discount gas stations in Pennsylvania and New Jersey that sold gasoline at $3.47 per gallon in July 2026.
Freedom Mobile
Freedom Mobile, formerly WIND Mobile, is a Canadian regional wireless carrier owned by Quebecor through Videotron, operating its own network in Ontario, Alberta, and British Columbia.
Freedom of the Seas (ship)
Freedom of the Seas is a Royal Caribbean cruise ship that was the world's largest at its 2006 debut, taking the record from Queen Mary 2.
Freedom-class littoral combat ship
The Freedom-class littoral combat ship, also called the Freedom-class frigate, is a class of 16 fast U.S. Navy warships built by a Lockheed Martin team at Marinette, Wisconsin, between 2008 and 2025.
Freedom.gov
Freedom.gov is a US government website, registered in 2026, reported as a State Department portal to let users in Europe view content banned by their governments.
Freedoms of the air
The freedoms of the air are nine numbered commercial aviation rights, the first five formulated at the 1944 Chicago Conference, describing what airlines may do in foreign airspace.
FreeDOS
FreeDOS, originally announced as PD-DOS in 1994, is an open source DOS-compatible operating system for IBM PC-compatible computers, developed by volunteers and still actively developed.
Freefly Alta X
The Freefly Alta X is a heavy-lift quadcopter drone made by Freefly Systems of Woodinville, Washington, launched in 2019 to carry cinema cameras and LiDAR payloads up to 33 lb.
Freelancer.com
Freelancer.com is an Australian online freelance marketplace founded by Matt Barrie in 2009 where employers post projects and freelancers bid; it listed on the ASX in 2013 and has over 86 million users.
Freelander 8
The Freelander 8 is a full-size extended-range electric SUV, the first model of the revived Freelander brand, built in Changshu, China by the Chery Jaguar Land Rover joint venture.
Freely
Freely is a free British streaming TV platform launched in April 2024 by Everyone TV, offering live channels and on-demand content from the UK's public service broadcasters.
Freemium
Freemium is a business model offering a basic product or service free of charge while selling a paid premium version with additional features, named in 2006 by Fred Wilson.
Freenode
Freenode, formerly the Open Projects Network, is an IRC network serving free and open source software communities since 1998; most projects left for Libera Chat after a 2021 ownership dispute.
Freepik
Freepik is a Spanish freemium platform founded in 2010 in Málaga that grew from a search engine for free graphics into a generative AI suite, renamed Magnific in 2026 with over 1 million paid subscribers.
Freeport LNG Terminal
Freeport LNG Terminal is a liquefied natural gas export terminal on Quintana Island near Freeport, Texas, converting from imports in 2008 to LNG exports beginning in 2019.
FreeRTOS
FreeRTOS is an open-source real-time operating system kernel for microcontrollers, created by Richard Barry around 2003 and stewarded by Amazon Web Services since 2017 under the MIT license.
Freesat
Freesat is a subscription-free satellite television service in the United Kingdom, launched in 2008 as a BBC and ITV joint venture, offering over 170 channels to about 1 million homes.