google play books syncs across devices. but you must load your drm-free epub up to google's server for that to happen. google will allow you to upload your own books to its server.
i'm sure there are others. just not sure what others besides the kindle app.
but whatever the app is, i'm sure that in order to do this, they have to be synced to a server. you simply can't have the same book side-loaded on two different devices and hope that one device will be able to send the last read location to the other.
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