I'll recommend the obligatory Gothic 3. It's quite playable with the latest community patch.
Sadly only few people realize the greatness of Gothic with its actual huge open world, great world design and 3 completely different climate zones. Not even talking about the ton of quests, characters, atmosphere and opportunities for every class.
It's simply the best open world game concerning content and openness. If you look for a standard battle system and a shitty level system you will have to stay with the elder scrolls though.
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