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Kelvin Kuo/Associated Press

In one month, the NFL calendar will officially turn to the 2020 season—and the annual feeding frenzy that is free agency will begin in earnest.

Free agency technically begins with the "legal tampering" period on March 16, but come 4 p.m. ET on March 18, pen can be put to paper and players can start switching teams.

Over the next month there will be no shortage of stories about this year's crop of free agents. There will be rumors. Scuttlebutt. Misinformation. And intrigue galore.

But what makes one free agent more intriguing than another? Is it the size of his potential contract? His resume prior to free agency?

There's really no pat answer to that question. For one veteran quarterback, it could be closing his career with a new team after over a decade-and-a-half with another. For another one, it's the chance to get back to starting after a long hiatus caused by a brutal injury.

For a young wide receiver and a not-so-young corner, it's being the top option at a sought-after position. Or perhaps an offensive tackle with the opportunity to step out from behind two big shadows and shine in his own right.

Whatever the reason, these are some of the most intriguing upcoming free agents of the 2020 offseason.

And how things play out for them could have a massive impact on the season to come.

NOTE: You aren't going to find Tom Brady listed here. Or Derrick Henry. Or Amari Cooper. Or any of the other huge names who will as likely as not be staying put. Every one of the players in this article are good bets to be wearing a different helmet in 2020.