Ultima Online is a legend in MMORPG and many developers are still inspired by it today. Linkrealms is the latest one created by Mythyn Interactive and it has started closed beta on August 29 (learn what's new in CBT here). The game is a sandbox at its core with the possibility to acquire all skills and freely customize your character's combat role — the game has no class.
Another feature Ultima would like is different servers have their own rules. You can pick your server based on the rules you like. Not only rules but also landscape and dungeons will be different from server to server.
The game is free to play. You can sign up and download the game at the official site.