PFF Free Agency Tracker
Only RB left worth considering IMO is D'Onte Foreman, who actually could be a decent complimentary 'thunder' back to Zamir's 'lightning'. And at this point, I'm sure he'd come at near the league minimum salary.
A bunch of vet OTs remain unsigned. Guessing there may be a league-wide gap between what the OTs think they should be getting and how the league values them. A bunch of decent OGs left too.
Old pals Quinton Jefferson and Adam Butler still out there at DT. Same for Hankins and John Jenkins. Hoping for a couple names here on the cheap soon.
Young Edge rushers mostly picked over, save for Chase Young, who would be way to expensive and wouldn't fit the current Raiders roster anyway. Lots of oldies remain unsigned, so maybe a rotational value guy can be found for some golden years.
LB/CB/S all have some interesting names still on the list, but most of the good ones are oldies too.