Undrafted free agents are a bargain for NFL teams, which get "cheap labor" for training camp and potentially a diamond in the rough that surprises the league with their ability to take to coaching and translate their game to the next level.
Below is a ranking of the top five undrafted free-agent classes hauled in by teams since the end of the draft.
1. Dallas Cowboys
2. Baltimore Ravens
Although the Ravens selected Tray Walker in the fourth round, fellow cornerbacks Lewis and Wilson are no slouches themselves. Perry wasn't as heralded as teammate Landon Collins, but could prove himself a strong enough special-teams presence to earn a roster spot. Manton's not likely to unseat Justin Tucker, but if he doesn't end up on someone's practice squad this year, look for him to get a futures contract after the 2015 season and try to win the job if Tucker leaves as a free agent for 2016. Walker's versatility makes him a likely candidate to stick.
3. New Orleans Saints
Even though the Saints picked Stanford tackle Andrus Peat in the first round, the team needs more talent throughout the line -- so picking up the underrated Gambrell and Hickey after the draft was key. Richardson, Barnes and Eulls all have a good chance of eating up one or two spots on New Orleans' front line-depth chart.
4. Miami Dolphins
Miami made sure to line up the best inside linebacker prospects still on the board after the draft, and if both Hull and Vigil don't make the team, they should be signed elsewhere. McCarthy's athleticism is worth a shot, and maybe he'll mature in the professional environment. Drew was an underrated prospect who could also flourish. Jones could alleviate some or all of Jarvis Landry's return responsibilities, if he can prove himself a reliable fifth or sixth receiver option.
5. Tennessee Titans
Lott is exactly the type of size/athleticism prospect that will excel in the Titans' defense. Prewitt is not the cover safety teams are looking for right now, but his tenaciousness should earn him a special-teams coverage spot and, eventually, playing time on defense. The rest of this crew will at least provide excellent competition for a team desperately in need of it.