Terms were not disclosed.
Douglas finished his career at the University of Washington with a 42.8-yard gross punting average. He handled the Huskies' punting for each of the last three seasons, recording gross yardage averages of 42.6, 42.6 and 43.2 from 2004-06. In 2006, Douglas punted 72 times for 3,110 yards with 22 kicks downed inside the opponents' 20-yard line.
Pittman participated as a tryout player in Tampa Bay's three-day rookie mini-camp from May 4-6. In 2006, Pittman totaled 24 tackles, 5.5 tackles for loss and one sack at the University of Central Arkansas. In his first season at UCA after transferring from Southwest (MS) Community College, he recorded 50 tackles, 10 tackles for loss and 5.5 sacks in 2005.
Mackey and Rivas were signed as undrafted free agents following the 2007 NFL Draft.