Play free-to-play, with optional subscription games
Free-to-play games (commonly known as F2P) can be freely downloaded, installed and played without paying, usually with some kind of limitation. Some free-to-play games such as MMOs follow an optional subscription business model. By paying a fixed monthly amount you obtain quite a few benefits such as increased experience gain, cosmetic enhancements, additional content available for free.
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RIFT
RPG / MMORPG
Trion Worlds

EVE Online
simulation / MMORPG
CCP Games

Star Trek Online
RPG / MMORPG
Cryptic Studios

The Lord of the Rings Online
RPG / MMORPG
Turbine

Runescape
RPG / MMORPG
Jagex Games Studio

Champions Online
RPG / MMORPG
Cryptic Studios

World of Warcraft
RPG / MMORPG
Blizzard Entertainment

Anarchy Online
RPG / MMORPG
Funcom

Video Strip Games
card game / strip poker
videostripgames.com