Rogers, 27, was an underrated producer for Milwaukee last season, hitting .296/.367/.441 with four home runs in 152 at-bats. He has the ability to play both corner infield spots as well as left field, and will give the Pirates an additional option as they try to replace Pedro Alvarez at first base.
Pittsburgh currently has Mike Morse, Sean Rodriguez and Jake Goebbert on its depth chart at first base, so the addition of Rogers gives them a right-handed, offensive-first option at the position. Jung-ho Kang and Josh Harrison are in the mix for playing time at third base.
Broxton, 25, spent the majority of last season in the minors, hitting .273/.357/.438 with 39 steals at Double-A and Triple-A. He is a speedy outfielder who will immediately join the Brewers' 40-man roster.
Supak, 19, was Pittsburgh's 2nd-round pick in the 2014 draft and has posted a 5.85 ERA in 16 appearances (14 starts) over his first two years of pro ball. MLB.com ranks Supak as the 15th-best prospect in Pittsburgh's system, noting that he is still raw due to his age and could project as a major-league starter.