I just started playing http://www.ragnarokrevolution.com It’s so much fun 
I mean I have played other FREE Ragnarok Online servers before but nothing like this. The GMs seriously know what they are doing, they have been online since 2004. And they seem to ALWAYS be up to date with the latest kRO features.
I met so many friends there too 
Everyone is sooo nice. I love Ragnarok Revolution! It’s the favorite Ragnarok Online private server.