Kirsty from Fatgirlskinny.net has followed slimming world from home to lose 5 stone in weight. She set up har blog 5 years ago, along with an instagram account to get support without needing to go to a group. Her site is really professional and contains a mix of resources. These include recipes, advice on the different elements of the slimming world diet and much more. There are some sections about Weight Watchers, but not other diets such as low carb. She obviously has a big following and engages with her followers on the blog.
This is a useful website, mainly for the large number of recipes.