Some possibilities:
Redskins
WR DeSean Jackson
WR Pierre Garcon
TE Vernon Davis
DE/NT Chris Baker
ILB Will Compton (RFA)
ILB Perry Riley (played on the Raiders in 2016)
NT Terrance Knighton (released at final cuts in 2016)
ILB Keenan Robinson (played on the Giants in 2016)
CB Chris Culliver (missed all of 2016 with an injury)
Broncos
OLB DeMarcus Ware
NT Sylvester Williams
DE/NT Vance Walker
DE Billy Winn
ILB/OLB Dekoda Watson
ILB Todd Davis (RFA)
OLB Lerentee McCray (played on the Bills in 2016)
CB Kayvon Webster
There are other players who played under Wade Phillips in previous stops (Houston and Dallas) who might be in play as well. Sean Lissemore, Johnathan Joseph, Earl Mitchell, D.J. Swearinger, Brian Cushing, Terrell McClain, Antonio Smith, Terrence Newman, Mike Jenkins, Orlando Scandrick, and Barry Church are all guys who played under Wade and might be available this offseason.