NFLDraftBible has a list of reported Eagles undrafted rookie free agent signings.
DT Charles Alexander, Louisiana State
RB Keith Flemming, West Texas A&M
WR Kevin Jurovich, San Jose State
CB Josh Morris, Weber State
NEPatriotsdraft.com, who seems to have carved out a niche finding these signings out has some more reported names not on the NFL Draft Bible list.
Blue Cooper, WR, Tenn-Chattanooga
Chris Zardas, FB, Umass
Pat Simonds, WR, Colgate
Joey Elliott, QB, Purdue
We'll update as some of these are confirmed or debunked.