Be aware that some of these have yet to be confirmed, and may be taken down.
QB Josh Portis, Cal
Portis has all the tools of an NFL quarterback and all the red flags that typically prevent QB's from succeeding in the NFL. Size and arm strength are there, as well as rare straight-line speed that allows him to salvage broken plays. Workable accuracy, but nothing eye-catching. Played in a simplified offense and will face the usual learning curve with progressions and reads, as well as questions about decision-making and difficult throws. Apparently tends to stare down his receivers.
DE Pierre Allen, Nebraska
Consistent, aware, disciplined, plenty of experience, Allen looks like another mid-round rotational player who's a bit of a scheme guy. Probably solid against the run but not much in the way of pressuring QB's, lacking elite quickness and pass-rush arsenal. Has good size and could find a spot on PC's unconventional defense. Kind of intriguing.
FB/TE Ryan Travis
Looks like a system product. Put up good numbers as H-back in West Liberty, but lacks the size, speed, and blocking to make it in the pros. Could be a good weapon in the short passing game, and does have a good determined attitude.
G Zach Hurd, UConn
"A guard trapped in a tackle's body", as one scouting report has it. Strong, durable, sounds like a solid road-grader type, although he's 6'7" and may struggle with leverage as such. Stock was kept low by technique issues all across the board, a lack of fluidity, and difficulty in pass protection. Could have been drafted in the middle rounds otherwise, and may be good depth for our running-focused OL. One of our best UDFA signings so far, I'd say.
LB Michael Morgan, USC
Didn't have the senior season he needed to really grab NFL attention. Had a solid junior campaign in which he managed to temporarily nail down a starting job, which on USC isn't a small accomplishment. Flashed some pass-rush ability in 2009 that didn't return the following year. Fast (4.4 40 time) for a big and heavy linebacker (6'4", 220 lbs), so maybe some potential there.
DT Ladi Ajiboye, South Carolina
Finally, Pete Carroll remembers that we need a defensive tackle. Ajiboye doesn't look like much more than a situational player, though. He looks like an excellent penetrator when given a clear shot at the target, but struggles to disengage and fight through blockers. This is partially because of technique issues and partially because he's undersized (6'1") for a DT and possesses short arms. Looks more suited for one-gap schemes than the two-gap Carroll has instituted.
FS/CB Jesse Hoffman, Eastern Washington
The local kid and hybrid defensive back is also pretty small for the pros. He merited a visit from Jacksonville, but projects as a free safety in the NFL and bears very limited measurables. Had some impressive stats as a returner.
S Ricky Thenarse, Nebraska
Not sure what this guy brings to the table. 6'1", 210 pounds, not a lot of intelligence available on him. Most college experience seemingly came on special teams.
WR Ricardo Lockette, Fort Valley State
One of those all-tools-no-polish prospects that require a ton of development, Lockette has prototypical NFL size (6'2"), speed (4.37), hands (9 5/8), and athleticism. The rest - messy routes, lack of concentration, low competition - is unremarkable. Sounds like a project athlete from other sports disciplines, not unlike Jordan Kent or Jameson Konz. Gunner upside, probably.
S Jeron Johnson, Boise State
Surprisingly short for a Carroll defensive back, the 5'10" Johnson posted one of Combine's best 40 times and is known for physical play and solid tackling. His instincts in zone coverage and his lack of size appear to be largely the things holding him back, though he was something of an under-the-radar star at Boise State. Seems decent in the turnover department.
OT Brent Osborne, Harvard
The senior tackle from Harvard is 6'5" and started plenty of games in his last two seasons, mostly at right tackle. One of the few scouting articles I found on him says that he plays with "a very physical, violent temperament on the field" and "tries to punish people". With listed weights ranging from 277 to 295 pounds, however, he's probably far too underweight to play in the pros.
Stay tuned on my Twitter account for further updates. With the extra emphasis on UDFA's this year, their signing period could turn into a mini-draft.