Anyone ever play Ragnarok Online?

Its a Korean MMORPG by Gravity Co. based on a popular comic called Ragnarok. It was released in 2002 and its somewhat old but still pretty popular, especially in asian countries. The game borrows heavily from Norse mythology.

There are a quite a few free private servers that you can find to play the game, but they're generally quite smaller than the official pay to play servers.

You can probably find a list of servers on a website called ratemyserver
To play on them, you'll need the official kRO and Sakray files which can be found on that website.