Wellbeing.com, Boots' online brand, and gift site Memorise This (www.memorisethis.com) have also signed up to a festive-themed section within BTopenworld's consumer portal (www.btopenworld.com/shop/xmas).
"BTopenworld is looking for new brands to work with on the Christmas site," said a spokeswoman for BTopenworld. "There will be more as we move closer towards Christmas, and the site will be updated."
Users will be able to search for gifts from e-commerce partners including mobileshop.com, as well as being able to arrange personal festive phone calls or letters to Santa Claus through www.santa-claus.com.
The BT site is offering narrowband ISP users the chance to win a trip for four people to Lapland with Jetline Travel.
Nick Hazell, senior vice-president of presentation, production and reputation at BTopen-world, said the section formed a part of BTopenworld's plans to offer a wide range of products to users.
The enterprise comes as BT Broadband, the telco's no-frills high-speed internet access service, this week launched three TV ads in the latest stage of its £33 million 'Broadband has landed' campaign.
One ad will feature Smokey and Streaky, two motorbike-riding pigs created by production firm Aardman Animations.