The pair of departures add to a busy off-season for the Bombers, who have delisted four players already this year, while a further five have left the club through trades or retirement.
Snelling played 64 games for Essendon after being recruited through the 2019 Mid-Season Draft, returning to the AFL after spending three years on Port Adelaide's list, where he managed the one game.
The South Australian booted 28 goals during his time with the Bombers as a midfield-forward hybrid, with his 2023 campaign including 15 matches for a return of six goals.
Voss would not make his AFL debut during his time at the club, having spent his time mostly at VFL across his two years with the Bombers.
“We thank both Will and Pat for their commitment and contribution to the Essendon Football Club during their time in the red and black,” Essendon list manager Adrian Dodoro said in a club statement.
“They are both much loved throughout the club and we wish them all the best for their future endeavours.”
The pair join Massimo D'Ambrosio (Hawthorn Hawks), Alastair Lord (delisted), Cian McBride (delisted), Anthony McDonald-Tipungwuti (retired), Rhett Montgomerie (delisted), Anthony Munkara (delisted), Andrew Phillips (retired), James Stewart (delisted), Brandon Zerk-Thatcher (Port Adelaide Power) in leaving Essendon this off-season.
Clubs are required to make their first list lodgement on October 31.