Are you looking for a truly non-linear RPG? If so, you should probably ask yourself why- but in the meantime, Mount & Blade comes pretty close to providing a fully open-ended roleplaying experience that doesn’t scrimp on the action. A huge medieval adventure awaits, with only the barest of storylines stringing it together. You’re pretty much free to carve your own destiny and explore the expansive game world at your own pace.
Which of course, brings all the usual problems of poor pacing and technical issues. Note that this is part of a package, but we reckon that it's a false saving.