Otis, 25, was signed by the Raiders last offseason as an undrafted free agent out of Columbia. He was released near the end of training camp and did not appear in any of Oakland's four exhibition games.
Meyer, 25, spent time in camp with the Cincinnati Bengals and Seattle Seahawks the past two seasons. Before that, he was drafted by the Cincinnati Reds in 2001 and the Giants in 2004 and '05 as a pitcher.
In other news, the Raiders re-signed linebacker Jon Alston. He was an exclusive rights free agent who the Raiders liked enough to bring back as a special teams player and situational player on defense.