Cleveland has the cap space, and are reportedly planning to use it this free agency period.
Reports have linked Ravens LBs Paul Kruger and Dannell Ellerbe there, along with cornerback Cary Williams. James Harrison's agent said he'd be interested in a contract with the Browns, but the main one is from the Orange and Brown Report, who reported Cleveland is interested in CB Keenan Lewis.
Lewis was second in the NFL in pass break-ups in 2012, and his size (6-foot-1, 204 pounds) and age (26) will likely land him a fairly lucrative contract.
Cleveland has the cap space, and are reportedly planning to use it this free agency period. The Steelers have two days and change to ink Lewis to a deal before he would hit free agency. The fact he hasn't yet to this point isn't indicative of the interest or lack thereof from either side, but it does likely mean, if the Steelers will sign him, it will be after he's had the chance to weigh his options with the rest of the league.