Keep in mind that until the Lions release an official list of their undrafted free agent signings that nothing is official, but below is a list of players that have reportedly agreed to a deal with Detroit. (List will be updated as the news comes in)

RB Aaron Higdon - Charleston (Source: University of Charleston)
FB Matt Clapp - Oklahoma (Source: Aaron Wilson)
WR Michael Moore - Georgia (Source: John Niyo)
WR Jessie Hester - South Florida (Source: St. Petersburg Times) *TRYOUT*
TE Richard Dickson - LSU (Source: Aaron Wilson)
OT Mike Hicks - Connecticut (Source: Hartford Courant) *TRYOUT*
DE Chima Ihekwoaba - Wilfrid Laurier (Source: TSN) *TRYOUT*
DT Robert Callaway - Saginaw Valley State (Source: John Niyo)
LB Ryan Stamper - Florida (Source: OnlyGators.com)
LB John Jacobs - Saginaw Valley State (Source: The Saginaw News) *TRYOUT*
CB Aaron Berry - Pittsburgh (Source: The Patriot-News, which reports that he also had offers from the Jets, 49ers, and Raiders)
DB Randy Phillips - Miami (FL) (Source: Omar Kelly)
LS Sam Scroggins - West Virginia State (Source: Ed Thompson)