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Paddy Power
Bet on horse racing, football and the lottery in the UK and Ireland.
https://www.paddypower.com/

Parbet
Peer to peer betting exchange marketplace.
http://www.parbet.com/

PC Sports
Provides wagering on sports such as rugby, soccer, racing and golf from this Ireland's company.
http://www.pcsports.ie/

Players Only
International sportsbook with live odds large prop selection, free demos and a casino link.
http://www.playersonly.com