Ladbrokes are huge UK bookmakers who have also launched their professional betting products and many great services (incl the exciting Cash Card) into Australia.
Unibet is a leading European sports & racing bookmaker which also debuted into Australia in 2012, through their acquisition of then Australian online bookie Betchoice.com.au
Betfair is totally different to your standard online bookmaker. They are a betting exchange (similar to a stock exchange) where you can both back and lay bets. Join Betfair by clicking the link below.