Editor's note: Raiders Insider Scott Bair's free agent tracker will be updated frequently; bookmark and refresh this space frequently often
Friday: 4:40 p.m. -- Raiders sign defensive lineman Antonio Smith
Friday: 4:18 p.m. -- Vance Walker agrees to deal with Chiefs
Friday, 4:15 p.m. -- Raiders sign former 49ers CB Tarell Brown
Thursday, 7:15 p.m. -- Free agent left tackle Donald Penn visited the Raiders
Thursday, 3:30 p.m. -- Raiders sign LaMarr Woodley to two-year deal
Thursday, 12:15 p.m. -- Raiders announce signing of Justin Tuck
Thursday, 11:05 a.m. -- Justin Tuck, Lamarr Woodley and Jason Hatcher are back at Raiders headquarters, according to Vic Tafur.
Thursday, 10:45 a.m. -- Raiders free agent cornerback Tracy Porter has agreed to terms with the Redskins and will sign a contract pending a physical.
Thursday, 10:45 a.m. -- Raiders free agent defensive tackle Pat Sims will visit the Tennessee Titans, according to Jim Wyatt of the Nashville Tennessean.
Thursday, 8:00 a.m. -- Rodger Saffold signed a five-year, $31.7 million contract with the Rams that includes $19.5 million guaranteed, according to Adam Schefter.
Wednesday, 7:15 p.m. -- The Raiders announced Rodger Saffold failed his physical, nullifying the five-year, $42 million contract that was on the table.
Wednesday, 2:15 p.m. -- Reports indicate Houston defensive lineman Antonio Smith will visit the Raiders. The team also has interest in Bears defensive tackle Henry Melton.
Wednesday, 11:26 a.m. -- Charlotte Observer reports that Raiders could be a landing spot for WR Steve Smith.
Wednesday, 11:17 a.m. -- NFL Network reports that DT Jason Hatcher will visit the Raiders late Tuesday.
Wednesday, 10:07 a.m. -- ESPN reports that CB Terrell Thomas and RB Andre Brown will also visit the Raiders.
Wednesday, 10:04 a.m. -- CSN Bay Area confirms the Raiders have an offer on the table for DT Vance Walker, but the veteran will scan free-agent market.
Wednesday, 7:24 a.m. -- ESPN reports DE Justin Tuck and OLB Lamarr Woodley will visit the Raiders later today.
Tuesday, 9:45 p.m. -- Reports: Raiders strike deal with RT Austin Howard.
Tuesday, 9:30 p.m. -- Source reveals complete contract terms for OL Rodger Saffold.
Tuesday, 9:21 p.m. -- Source reveals that Raider expect new OL Rodger Saffold will play left tackle.
Tuesday, 9:11 p.m. -- New York Daily News reports that RT Austin Howard agrees to contract terms with Raiders. Later learned to be five year, $30 million ($15 million guaranteed).
Tuesday, 8:30 p.m. -- NFL Network reveals the CB Tracy Porter visiting the NY Giants on Tuesday night.
Tuesday, 3:30 p.m. -- ESPN reports that Raiders have been discouraged from pursuing a trade for Tampa Bay star CB Derrelle Revis.
Tuesday, 2:43 p.m. -- New York Daily News reports that free agent right tackle Austin Howard will visit the Raiders.
Tuesday, 2:31 p.m. -- A source confirms to CSN Bay Area running back Darren McFadden signs a one-year, $4 million contract to stay with the Raiders.
Tuesday, 2:17 p.m. -- Running back Rashad Jennings tweets that he will leave the Raiders in favor of the New York Giants.
Tuesday, 1:15 p.m. -- Raiders sign offensive lineman Rodger Saffold to five-year deal reportedly worth $42.5 million.
Tuesday, 1:12 p.m. -- Lamarr Houston agrees to terms with Chicago Bears on five-year deal reportedly worth $35 million.
Tuesday, 1:10 p.m. -- Jared Veldheer agrees to terms with Arizona Cardinals on five-year deal reportedly worth $37.5.
Tuesday, 12:15 p.m. -- Raiders reported to be pursuing Darrelle Revis, who is on the Buccaneers' trading block.
With the NFL free-agent signing period set to begin at 1 p.m. (PT), the Raiders have work to do; general manager Reggie McKenzie reminded us back in January that the Raiders have needs, "with an 'S.'"
[RELATED: Raiders free agency primer]
Salary Cap space: $55.763 million*
*League-high total listed by NFL on Tuesday morning. Recent totals decreased to include bonuses paid.
Offense: QB, RB, WR, OT, G
Defense: DE, DT, FS, CB
Raiders unrestricted free agents:
RB Rashad Jennings
RB Darren McFadden
WR Jacoby Ford
TE Jeron Mastrud
OT Tony Pashos
OT Jared Veldheer
G/C Andre Gurode
DE Lamarr Houston
DE Jason Hunter
DT Daniel Muir
DT Pat Sims
DT Vance Walker
CB Phillip Adams
CB Mike Jenkins
CB Tracy Porter
S Charles Woodson
S Usama Young