Astros start to release guys who are no longer in their 2016 plans (from the Apply League and MWL transactions pages):
LHP Zach Davis--25th round pick in 2014 out of Central Missouri State (Jim Crane's school, which I'm sure didn't hurt his chances any of getting drafted by the Astros). Topped out at QC last season.
RHP Jorge Perez-30th rounder in 2013 out of Seminole JC. Struggled with his control all 3 seasons in the organization, even more so at QC last season.
LHP Lachlan Madden-one of three Aussie guys signed several years ago. Bonus wasn't reported at the time (IIRC) so presumably nominal dollars were involved.
LHP Starlyng Sanchez--signed back in 2012 out of the DR, spent all or parts of 3 seasons in the DSL (also spending some time stateside).
RHP Joselo Pinales--another Dominican signee in 2012, topping out in the NYP last season. Signed for $70K.
LHP Alejandro Solarte--came from the Blue Jays in the Adron Chambers trade back in 2014. Struggled at Greeneville last season.