What do you mean exactly with Motion Capture? If you’re asking if Unity supports it out of the box: No, Unity does not. But of course you CAN use motion capturing in your projects. With Kinect and Motion Builder, for example: http://www.youtube.com/watch?v=i5PwBzYrC_I
With Motion Capture I mean that I can record cutscenes like in my case interrogations and stuff like that. Thanks for the link! It’s looking very good.
Have to agree with squared. Reading into the OP’s questions, I surmise he may be heading down a path that will be harmful in the end. However, I’d still like to answer the original questions… Yes, Unity can support open worlds, though it’s hard and expensive and may not be Unity’s best strength. Yes, you can sell games with Unity Free, up to $100K per year. Yes, you can use motion capture equipment and software and import the animations into Unity.