Interestingly enough, the DLC to the latest SW game, Outlaws, which takes place somewhere before the events of the OT, features an Imperial governor who thinks the Empire is about to collapse and is preparing to carve out a slice of it once it does.
Not what you asked for, but still.
Not what you asked for, but still.
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In there, you VERY TECHNICALLY end up liberating a planet (or a moon, rather) from the Empire... in that you steal a starchart that would lead that governor guy to it and hand it over to Lando and his rebel buds, who are implied to have plans for a secret base there.