Make money, betting without risk, using a technique called arbitrage. Their guide book will teach you how to identify opportunities, where to find them and how to structure your bets. They also provide a "BetAlerts®" service, where they will send you details of arbitrage opportunities they discover.
Online arbitrage calculator for risk-free backing and laying on the exchanges. Incorporates commission rates and different criteria (back bet, lay bet or total stake). Their site also has other useful betting tools.
Horse Racing Arbitrage software that finds arbitrage bets on the UK and Irish horse racing markets. The software scans all the racing markets for the day and gathers the latest odds from Betfair and bookmakers sites.