ZeniMax Online Studios LLC is a subsidiary of ZeniMax Media, specializing in the development of massively multiplayer online games. The company developed The Elder Scrolls Online and its downloadable content. ZeniMax Online Studios had around 250 employees in 2012. In addition to the main Hunt Valley, Maryland based office, ZeniMax Online also maintains a customer support center in Galway, Ireland as well as an additional office in Austin, Texas. ZeniMax Online Studios was officially formed in 2007 by ZeniMax Media, and is headed by Matt Firor, a massively multiplayer online game designer and an 11-year veteran of Mythic Entertainment. The company was built to specialize in the creation of an massively multiplayer online game. In 2007 the company announced a partnership with Simutronics for the use of HeroEngine. In June 2008, ZeniMax Online Studios moved into its current office in Hunt Valley. On March 15, 2010, ZeniMax Online Studios announced that it will be using the Fork Particle SDK to create the particle effects in its unannounced upcoming massively multiplayer game. On March 15, 2011, ZeniMax Online Studios announced plans to open a customer support center in Galway, Ireland. The company's new facility will provide customer support for players of their future massively multiplayer online games and is expected to result in the creation of hundreds of jobs over the next several years. On August 8, 2011, ZeniMax Online Studios selected Splunk to be its platform for business intelligence, network operations monitoring, and operational intelligence. On March 6, 2012, ZeniMax Online Studios signed a licensing deal with Elastic Path Software. On May 3, 2012, Game Informer announced that ZeniMax Online Studios's video game in development will take place in The Elder Scrolls universe, approximately a millennium before the events of The Elder Scrolls V: Skyrim. The game, The Elder Scrolls Online, was released in 2014.

Known For: The Elder Scrolls Online

Zipper Interactive was an American video game developer located in Redmond, Washington and part of Sony Computer Entertainment Worldwide Studios. It was founded in June 1995 by Jim Bosler and Brian Soderberg. It created many different games, including the SOCOM U.S. Navy SEALs series of games. SOCOM U.S. Navy SEALs was created in collaboration with the Naval Special Warfare Command and published by Sony Computer Entertainment for the PlayStation 2. On January 25, 2006, Sony announced that it had acquired Zipper Interactive to add it to its group of development studios. On March 29, 2012, Sony announced that it would be closing Zipper Interactive due to resource re-alignment. The closure of Zipper Interactive was later confirmed by Sony Computer Entertainment the next day on March 30, 2012. Prior to its closure, Zipper Interactive were working on two unannounced titles for the PlayStation 4 before both projects were cancelled once the closing was complete. One was another entry in the U.S. Navy SEALs series, and the other was a first-person shooter meant to be a new IP.

Known For: DeathDrome, Top Gun: Hornet's Nest, Recoil, MechWarrior 3, MechWarrior 3: Pirate's Moon, Crimson Skies, SOCOM U.S. Navy SEALs, SOCOM II: U.S. Navy SEALs, SOCOM 3 U.S. Navy SEALs, SOCOM U.S. Navy SEALs: Fireteam Bravo, SOCOM U.S. Navy SEALs: Combined Assault, SOCOM U.S. Navy SEALs: Fireteam Bravo 2, MAG, SOCOM 4 U.S. Navy SEALs, Unit 13

Zombie Studios was an American independent video game developer of console, PC, mobile and web-based games. It was formed in 1994 as Zombie, LLC by Joanna Alexander and Mark Long, formerly of the Sarnoff Research Center. Alexander and Long founded Zombie after they completed the design of a virtual reality game console for Hasbro at Sarnoff in 1993. Zombie has designed and produced over 30 games for major platforms. From 1999 to 2004 the company was known as Zombie Inc. They created a value label in 2005, Direct Action Games, to design and produce value titles for both PC and consoles. Their titles span a range of product genres including first-person shooter, real-time strategy, puzzle, arcade, adventure, hunting, and simulation. Zombie developed for a wide variety of gaming platforms including Xbox 360, PlayStation 3, PSP, PS2, Xbox, PCs, and mobile phones. Zombie Studios shut down in January 2015 with its owners' retirement. Former staffers of the company subsequently founded a new studio, Builder Box Games (now Hardsuit Labs), who acquired some of Zombie Studio's former IPs, including Blacklight: Retribution.

Known For: Ice & Fire (1995), Locus (1995), Zork Nemesis (1996), ZPC (1996), Spearhead (1998), Spec Ops: Rangers Lead the Way (1998), Spec Ops: Ranger Team Bravo (1998) (Rangers Lead the Way expansion), Body Glove's Bluewater Hunter (1999), Spec Ops II: Green Berets (1999), Spec Ops II: Operation Bravo (2000) (Green Berets expansion), Tom Clancy's Rainbow Six: Covert Operations Essentials (2000) (Rogue Spear expansion), Spec Ops: Stealth Patrol (2000), Spec Ops II: Omega Squad (2000), Spec Ops: Ranger Elite (2001), Spec Ops: Covert Assault (2001), Alcatraz: Prison Escape (2001), Atlantis The Lost Empire: Search for the Journal (2001), Atlantis The Lost Empire: Trial by Fire (2001), Delta Force: Task Force Dagger (2002), Super Bubble Pop (2002), Shadow Ops: Red Mercury (2004), Saw (2009), Blacklight: Tango Down (2010), Saw II: Flesh & Blood (2010), Blackwater (2011), Blacklight: Retribution (2012), Frogger: Hyper Arcade Edition (2012), Special Forces: Team X (2013), Teenage Mutant Ninja Turtles: Way of the Warrior (Plug and play CMOS camera video game), Daylight (2014), Phantom Army (2014)

ZootFly was a Slovenian video game developer specializing in the development of action adventure games for the Xbox, Xbox 360, PS3 and PC. ZootFly was a member studio of the International Game Developers Association (IGDA). The studio's most successful game was Marlow Briggs and the Mask of Death which made $45 million in revenue and has a score of 91% on Steam. ZootFly was acquired in 2013 by a casino equipment manufacturer Interblock.

Known For: see wiki's list

The company Zylom was a distributor of casual games for PC and Mac computers, as well as for devices like mobile phones and tablets. Based in Eindhoven, the Netherlands, Zylom delivers casual games throughout Europe. Zylom offered both online and downloadable games through its own direct-to-consumer website www.zylom.com, which has more than 800 different games to play and download. It also has a mobile website with games for tablets and mobile devices. Zylom also developed and published several of its own popular casual games, such as the Delicious series, the Campfire Legends series, and Heart’s Medicine. The company was purchased by RealNetworks and folded into their GameHouse division.

Known For: let wiki explain it to you

Zynga Inc. is an American social game developer running social video game services founded in April 2007 and headquartered in San Francisco, California, United States. The company develops social games that work stand-alone on mobile phone platforms such as Apple iOS, Android, Windows Phone and on the Internet through its website, Zynga.com, and the social networking website Facebook. Zynga states its mission as connecting the world through games. Zynga launched its best-known game, FarmVille, on Facebook in June 2009, reaching 10 million daily active users (DAU) within six weeks. As of August 2017 Zynga had 30 million monthly active users (MAU). In 2017 its most successful games were Zynga Poker, Words With Friends 2, with about 57 million games being played at any given moment, and CSR Racing 2, the most popular racing game on mobile devices. Zynga began trading on NASDAQ December 16, 2011 under the ticker ZNGA. 

Known For: see wiki's list