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Roughly there are around a thousand or more casinos online. Many of them use self-developed software, but the majority of well established and respected ones choose from a couple software brands. The typical version of software is customized for each casino but only at a cosmetic level. The gaming engine is the same and frequently, the group of online casinos use the same e-cash processor. Often casinos belonging to the group of online operators offer similar games, the odds on those games are the same and bonuses, policies, payout procedures for these casinos are the same. The most popular providers are:

Cryptologic is a Canadian casino software provider founded in 1995, with more than 100 employees worldwide. In November 1996, the first Cryptologic casino (Intercasino) went online. Cryptologic is listed on NASDAQ since March 2000, and on the Toronto Stock Exchange since September 1998. Cryptologic develops online casino gambling software, which is licensed through its wholly owned subsidiary, WagerLogic. In 2009 Cryptologic poker's network merged with Boss Media's IPN.


Microgaming is a privately held South African casino software provider that was founded in 1994. Microgaming employs more than 150 programmers who are engaged in developing and maintaining the Microgaming casino software. Microgaming is the oldest and one of the largest suppliers of online casino software in the world. Microgaming was awarded the 'Best System Provider' (2002) award by Gaming Express Magazine, and the "Top Casino Software - the player's choice" (2002) award by readers of Gambling Online Magazine. A lot of Microgaming casinos are licensed in the Mohawk Territory of Kahnawake (Canada). Almost all Microgaming casinos use Proc-Cyber Services as their e-cash processor. Microgaming is a member of the Interactive Gaming Council (IGC) - an organization committed to establishing an industry code of conduct, and Microgaming is fully adheres to this Code of Conduct, which includes regulations pertaining to transparency, fairness, licensing, customer privacy, prompt payouts and dispute resolution.


Boss Media is a Swedish casino software provider founded in 1996, with about 110 employees worldwide. It is listed on Stockholm Stock Exchange (nowadays OMX Nordic Stock Exchange). In 2002 it becomes a member of World Lottery Association (WLA), poker and lottery games are launched also in that year. Boss Media owns the e-cash processor WebDollar. It's portfolio of casinos includes many clients that originate from the land-based gambling industry. In 2009 Cryptologic poker's network merged with Boss Media's IPN.


Playtech is an Israeli-owned casino software provider founded back in 1999. It's main headquarter is located in Isle of Man and it's main dev center is in Tartu, Estonia. It is traded on the Alternative Investment Market of the London Stock Exchange and has excellent reputation in the online casino gambling industry. In 2002 a number of reputable online casinos joined Playtech. Games Supported: Blackjack, Blackjack Switch, Baccarat, Caribbean Poker, Casino War, Let Them Ride Poker, Pai Gow Poker, Poker Three, Red Dog, Table Games, Roulette, Sic Bo, Craps, American Roulette, Progressive Games, Cinerama slot machine, Fruit Mania slot machine, Diamond Valley slot machine, Magic Slots slot machine, Gold Rally slot machine, SafeCracker slot machine, Wall St Fever slot machine, Mega Jacks Poker, Normal Slots, Bonus Slots, Multiline Slots, Video Poker, Keno.