Free agency continues and the San Francisco 49ers have been busy making roster changes. Let's take a look at what has gone on so far:Returning free agents: Receiver Anquan Boldin, kicker Phil Dawson, cornerback Eric Wright, receiver Kassim Osgood, cornerback Perrish Cox.2015 free agents extended: Center Daniel Kilgore, fullback Bruce Miller.Departed free agents: Safety Donte Whitner (Cleveland), cornerback Tarell Brown (Oakland), running back Anthony Dixon (Buffalo), receiver Mario Manningham (Giants), quarterback Colt McCoy (Redskins).