Posted by ESPN.com's Kevin Seifert
Many of you are asking about the college free agent signing period, which began immediately after the draft ended Sunday night. Sometimes these players get more money and have a better chance to make the team than low-round draft picks.
Chicago and Minnesota have made formal announcements, while reports of Detroit and Green Bay are trickling in from local media outlets. Keep in mind that teams add and subtract from these lists regularly as training camp approaches. Also, note that some of the links take you to players who have been invited to rookie mini-camp this weekend on a tryout basis.
Here's a quick look with links if you're interested in all the gory details:
Total known signed undrafted players: 9 (Courtesy Chicago Bears)
Highlight: Cal fullback Will Ta'ufo'ou. A powerful blocker at 5-11 and 253 pounds, Ta'ufo'ou has a chance to stick.
Total known signed undrafted players: 4 (Courtesy the Oakland Press)
Highlight: Wake Forest receiver D.J. Boldin. He's the brother of Arizona receiver Anquan Boldin.
GREEN BAY PACKERS
Total known signed undrafted players: 10 (Courtesy the Green Bay Press-Gazette)
Highlight: The group includes five receivers, temporarily giving the Packers 13 receivers on their roster.