Each area will carry its partner's branding and each partner will handle all aspects of security, payment and age policing.
John Raczka, senior vice-president of content at BTopenworld, said: "We felt that if gambling was to take place in our environment, it should be safe. BT-openworld will not participate in individual bets, as revenues will be derived from tenancies and commissions from bringing new subscribers to partners."
BTopenworld becomes the first UK ISP to partner with Las Vegas casino operators Station Casinos and SunOnline, both of which are licensed in the Isle of Man. As well as casino games, the betting site will offer joint promotions with Sun's Atlantis resort in the Bahamas.
UKbetting.com will provide an online bookmaking service, daily sports news, reports and live scoring. Bookmaker Coral Eurobet will provide live odds, while Oddschecker will provide comparative odds.
A partnership with bingo giant The Rank Group will see Rank.com-branded bingo, keno, dice and fruit machine-style wagers appear on the site.
The lotteries section will include a free daily lotto.