Shaw, a standout at Florida State, was signed as an undrafted rookie by Cleveland in May and waived last month.
Carter, a sixth-round draft pick by Arizona in 2011, has spent time with the Cardinals, Dallas and Oakland in four years. He has played in 35 games with four starts. The Raiders waived him in May.
Hull, a seventh-round draft pick by St. Louis in 2010, played in 28 games for the Rams over three seasons. He also spent time with Washington and New England, which waived him Monday.
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