Stands for Java Gaming Experts. They're known for creating the game Runescape, an mmorpg. Some despise them, while others love them. Despite their growing number of fans, the only people to spread the word about them are people who have quit the game, giving it a bad reputation. The reason no good things are said about the company is becase everyone who likes them is to addicted to their games.
If Jagex advertised on Cartoon Network, they would control the next generation.