Salazar, who played 19 games for the Rockies in 2006, and Macri are returning to the organization. Salazar was a Rockies eighth-round pick in 2002 and Macri was a fifth-round choice in 2004.
Salazar, 30, has played in the Majors with the Rockies (2006), D-backs (2007-08) and Pirates (2009) and is a career .232 hitter in 168 games. Macri, 28, appeared in 18 games for the Twins in 2008 and hit .324 in 34 at-bats. Hulett, who turns 28 on Feb. 28, played for the Mariners (2008) and Royals (2009) and hit .194 in 45 total games.
All three have straight Minor League contracts, but the Rockies have not completed their invitations for Major League Spring Training.
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.