There is no definitive site listing every aspect of the history of Winster (yet).
For the moment, here are some pages about various aspects of village history, from the original Winster Website - thanks to Dermot McDaid for these.
History of the Greatorex family
History of Winster Post Office
There is also an excellent site on Winster Ancestry run by Dawn Scotting (in New Zealand!)
The wider UK and Irish Genealogy site has a specific Winster page
The Francis Frith collection have a page of photos and books about Winster.
You may also be interested in the Winster History Group.