Came across this unofficial list:
The UDFAs (Not Confirmed by the Texans)
*Also understand some of the players listed will be tryout players
Bryan Witzmann, OT, South Dakota State
Nathan Slaughter, WR, West Texas A&M
Max Bullough, ILB, Michigan State
Cory Henry, DE, Florida Atlantic
Anthony Denham, TE, Utah
Tyone Ezell, DT, Pittsburgh (TRYOUT)
Travis Labhart, WR, Texas A&M (Per David Nuno)
Chris Martin, OT, Central Florida
Chris Boswell, K, Rice
Chris McAllister, DE, Baylor
Matt Feiler, OT, Bloomsburg
Brendan Daly, LB, Hawaii, (TRYOUT)
Stan Grosz, DT, Cal Poly
Chris Young, LB, Arizona State
Wade Keliikipi, DT, Oregon (TRYOUT)
Austin Brown, DT, Miami (OH)
Jason Ankrah, DE, Nebraska
Nick Addison, S, Bethune-Cookman (TRYOUT)
Kjleby Oiland, C, Montana
Chris Coyle, TE, Arizona State
Marcus Williams, CB, North Dakota State
Terrance Lloyd, OLB, Baylor
Anthony McClung, WR, Cincinnati
Linky