Artix Entertainment are a reasonably big company based in Florida in the United States, and are famously know for creating the online RPG, Adventure Quest in 2002, which was probably one of my favorite games to play in primary school. They made other games such a Dragon Fable and Mech Quest, which i played too. They were founded by Adam Bohn in 2002 and have approximately 49 employees to this day. They are currently working on Adventure Quest 3D.
In 2001 Half Brick Studios were founded by 6 people in Brisbane Australia and in 2002 released Rocket Power:Beach Bandits and continued to release games to this day. Their most famous game was created in 201o was Fruit Ninja and was released for the iPod touch and iPhone and in July was released for the iPad. It was later released for the Window and Samsung products. It was even released for the Xbox 360 for the connect and Windows 8. Half Brick are growing to this day and have around 100 employees now.