The former Republic of Ireland international has signed on a non-contract basis.
The 35-year old, who has also played for Crystal Palace and Birmingham City, left Colchester United at the end of last season.
The striker is available to play for the Grecians in their League Two game at Accrington Stanley tomorrow night.
Work underway to return shingle to East Devon beach
Bulldozer in action for Storm Goretti clean up
Car park fees increase at Devon beauty spot
Northam Burrows season ticket to rise
Tank shell shut downs recycling centre
No one was hurt
Exeter's Royal Clarence hotel to be restored
'Progress is moving fast'
Man sought after alleged Plymouth assualt
Police would like to identify man
