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EA games makes the sims games.
Games owned by the publisher "Electronic Arts" typically use EA servers. Some games that use EA servers include Sim City, Mass Effect and Battlefield 3. Electronic Arts also has it's own digital distribution service known as Origin. Origin games use EA servers.
No, not currently, the source code is held by Ea games, and if they released it as open source it may hurt their financial gain.
An EA account is a good idea because it is free and gives you access to other great games. i would recommend making one.
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