The first 48 hours of NFL free agency are always active, with deals being struck left and right. The top free agents, such as Mario Williams and Vincent Jackson, sign right away as teams line up to talk to them.
After that, free agency starts to slow down and players begin to go on free agency tours, visiting several teams before making a final decision.
Even though many of the top free agents have signed deals, there are still some very good options on the market.
Here are the five best free agents still available.
It's quite surprising that there has been little to no interest in Brandon Lloyd during the first four days of free agency.
Despite working with suspect quarterback play in Denver and St. Louis in 2011, Lloyd still caught 70 passes for 966 yards and five touchdowns.
So far, the most likely destination for Lloyd is the New England Patriots, as he would excel in the team's spread offense.
Evan Mathis is, undoubtedly, the best available offensive guard in free agency. Rated the best left guard in 2011 by Pro Football Focus, Mathis is deserving of a big-time contract.
So far, Mathis has spent a considerable amount of time meeting with the Baltimore Ravens, and is expected to head back to Philadelphia to meet with the Eagles before making a final decision.
If the Ravens can get Mathis under contract, it would be a pretty solid replacement for Ben Grubbs, who signed with the New Orleans Saints on Tuesday.
Now that the top pass rusher in free agency, Mario Williams, is signed, John Abraham is going to start gaining some interest from teams.
Yes, Abraham will be 34 in May, but he still has a solid two or three years left in him. In 2011, Abraham recorded 9.5 sacks and four forced fumbles, so he still has plenty of gas left in the tank.
Expect a team such as the Tennessee Titans to make a push for Abraham, as the team is in dire need of an outside pass rusher.
Mike Wallace is different than the other four players on this list, as he is a restricted free-agent.
The Pittsburgh Steelers put a first-round tender on Wallace, meaning if a team wants to sign Wallace, it would have to give up the team's 2012 first-round pick.
Wallace is certainly better and more explosive than most receivers in the 2012 NFL Draft, so it's quite surprising that no teams have been willing to give up a first-round pick for him.
There's still a chance that a team with two first-round picks, such as the New England Patriots or Cincinnati Bengals, could make an offer for Wallace.
There's no denying the fact that Peyton Manning is the best available free agent. In fact, he is one of the greatest free agents in NFL history.
That being said, there has been no shortage of interest in Manning, with the Denver Broncos and Tennessee Titans showing the most interest.
Things will begin to heat up between Peyton Manning and possible suitors, as he is scheduled to workout for the Denver Broncos today in North Carolina.