This is a selected list of notable massively multiplayer online games which are free-to-play in some form without ever requiring a subscription or other payment. These are commonly MMORPGs or MMOFPSs, but could be of any genre.
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Free play
These MMOGs provide client software free of charge and allow users to play the game without requiring payment. The games' expenses are typically funded by sponsors or through donations (which have no effect in the game itself).
Free play with advertising
These MMOGs are free to play. They are funded through advertising, either in-game or through pop-ups.
Free play with micro-transactions
These MMOGs are free to play, but players may optionally purchase in-game items or currency.
Optional paid subscriptions
These MMOGs offer optional additional game content through paid subscription, but are otherwise free to play.
Buy to play
These MMOGs generally require an upfront cost to purchase the game client but are generally free to play without subscription fees. Players may optionally purchase in-game items or currency.
Free play in open or closed beta
These MMOGs are free to play. They are still in beta, or development stage.