Universe Online may refer to:
HeroEngine is a 3D game engine and server technology platform originally developed by Simutronics Corporation specifically for building MMO-style games. At first developed for the company's own game Hero's Journey, the engine won multiple awards at tradeshows, and has since been licensed by other companies such as BioWare Austin and Stray Bullet Games.
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A multiplayer video game is a video game in which more than one person can play in the same game environment at the same time, either locally or over the internet. During its early history, video games were often single-player-only activities, putting the player against preprogrammed challenges or AI-controlled opponents, which lack the flexibility of human thought. Multiplayer games allow players interaction with other individuals in partnership, competition or rivalry, providing them with social communication absent from single-player games. In multiplayer games, players may compete against one or more human contestants, work cooperatively with a human partner to achieve a common goal, supervise other players' activity, co-op. Multiplayer games usually require players to share the resources of a single game system or use networking technology to play together over a greater distance.
A massively multiplayer online game is an online game with large numbers of players, typically from hundreds to thousands, on the same server. MMOs usually feature a huge, persistent open world, although some games differ. These games can be found for most network-capable platforms, including the personal computer, video game console, or smartphones and other mobile devices.
NetDevil Ltd. was an American developer of massively multiplayer online games, based in Louisville, Colorado and owned by Gazillion Entertainment.

Petroglyph Games is a video game developer and publisher based in Las Vegas, Nevada, United States. The company was formed by the last group of ex-Westwood Studios employees who resigned when Westwood Pacific was shut down by Electronic Arts in 2003, effectively assimilating Westwood Studios into the EA Pacific studios in Los Angeles to form EA Los Angeles.
Multiplayer BattleTech: 3025 is a PC MMORPG developed by Kesmai during the same period as Microsoft's MechWarrior 4: Vengeance. The game occupies the fictional 31st century universe of BattleTech and focuses centrally on the large robotic war machines called BattleMechs ('Mechs) and the individuals who pilot them. The game was released as a beta in 2001 and shut down with little explanation on December 6, 2001.
Splash Damage Ltd. is a British video game developer that specializes in multiplayer first-person shooter video games. The studio is best known as the creator of the Wolfenstein: Enemy Territory and Enemy Territory: Quake Wars.
Kesmai was a pioneering game developer and online game publisher, founded in 1981 by Kelton Flinn and John Taylor. The company was best known for the combat flight sim Air Warrior on the GEnie online service, one of the first graphical MMOGs, launched in 1987. They also developed an ASCII-based MUD, Island of Kesmai, which ran on CompuServe.
Infinity is a postponed massively multiplayer online space simulation video game originally intended to be the first game built on the I-Novae engine by I-Novae Studios. While the I-Novae engine has been in development since 2004, development of Infinity never started.
Evochron Renegades is a freeform videogame that forms the 2007 installment in the indie StarWraith 3D Games series of space simulation games. It is the sequel to Evochron: Alliance 2.0. Evochron Renegades features a vast and seamless universe that lets the player fly anywhere, without loading screens or choppy environment flipping. The game is especially notable for being the successful product of a one-man development studio.
ZeniMax Online Studios LLC is an American video game developer and a subsidiary of ZeniMax Media, specializing in 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.
Planet Michael was a planned MMORPG inspired by the music, videos, and life of Michael Jackson. It was being developed by SEE Digital Studios AB and will be published by SEE Virtual Worlds, LLC. The game was originally scheduled to be released in 2011 but as of second quarter of 2018 nothing further has been released regarding this game other than some trailers from 2011-2012 that revealed little to no information regarding the game.
Disney Universe is a co-operative action-adventure video game developed by Eurocom and published by Disney Interactive Studios. It was announced at E3 in 2011 and was released on PlayStation 3, Xbox 360, Wii, and Microsoft Windows on October 25, 2011 in North America and October 28, 2011 in Europe. It features the ability to suit up as characters from multiple Disney franchises, including Aladdin, The Lion King, Monsters, Inc., WALL-E, Finding Nemo, Pirates of the Caribbean, Phineas and Ferb, and The Muppet Show.

Hi-Rez Studios is an independent, privately held video game developer based in Alpharetta, Georgia, United States. The company was established in 2005 by Erez Goren and Todd Harris. Hi-Rez Studios' games include the squad-based shooter Global Agenda, the critically acclaimed Tribes: Ascend, the third-person MOBA Smite, card game Hand of the Gods: Smite Tactics and the Hero shooter Paladins. In 2012, Hi-Rez Studios was recognized as a Top 30 Video-Game Developer by Game Developer Magazine and Gamasutra. Hi-Rez are the current owners of the Metaltech license, including Battledrome, Earthsiege, Starsiege, the CyberStorm series, and the Tribes series. With the exception of Battledrome and CyberStorm, the games were released as freeware by Hi-Rez on October 30, 2015.

Infinite Crisis was a 2015 multiplayer online battle arena (MOBA) video game based on the fictional universe of DC Comics, developed by Turbine and published by Warner Bros. Interactive Entertainment, loosely based on the comic book series of the same name. The game featured two squads of DC heroes and villains as they competed in combats across multiple destructive battlefields featuring in-game changing catastrophic events. It was a free-to-play game that was supported by micro-transactions.

Triad Wars is a cancelled open world online multiplayer video game developed by United Front Games in conjunction with Square Enix London Studios and published by Square Enix. It is a spin-off to the 2012 video game Sleeping Dogs and the second installment in the Sleeping Dogs series. The game had more traditional multiplayer online game elements than Sleeping Dogs, with the central goal being to "rise to power as a criminal kingpin of the Triad underworld." It featured the same map as the original Sleeping Dogs.
Massively multiplayer online real-time strategy game (MMORTS) mixes the genres of real-time strategy and massively multiplayer online games, possibly in the form of web browser-based games, in which a very large number of players interact with one another within a virtual world. Players often assume the role of a general, king, or other type of figurehead leading an army into battle while maintaining the resources needed for such warfare. The titles are often based in a sci-fi or fantasy universe and are distinguished from single or small-scale multiplayer RTSes by the number of players and common use of a persistent world, generally hosted by the game's publisher, which continues to evolve even when the player is offline.
Allods Team is a Russian game developer and a subsidiary of Mail.Ru Games. Founded in September 2006, it was previously known as Nival Online and Astrum Nival. On February 24, 2010, Mail.Ru announced the 100% acquisition of Astrum Nival from its former owners. From that point, Astrum Nival acts under the name of Mail.Ru. On September 29, 2011, the studio was renamed to Allods Team. The offices of Allods Team are located in Moscow, Voronezh and Bishkek.

Masthead Studios is a video game developer, founded in 2005 in Bulgaria, specializing in massively multiplayer online role-playing games.
The Witcher Battle Arena was a free-to-play multiplayer online battle arena (MOBA) video game developed and published by CD Projekt Red. The game released for Android, iOS, and Windows Phone devices in 2015, and was playable until the end of that year when the servers were closed.