some starter kits-

1.Dotnetnuke Web-Application

this application is an open source framework
appropriate to create,deploy & manage web,
intranet,extranet websites.Its a essential
tool for with lots of features for asp.net
developers.
you can free download here-
asp.net/downloads/starter-kits/
then select dotnetnuke.

2.TheBeerHouse
Its a content management system & e-commerce Kit
enables to implement a website.

TheBeerHouse starter kit enables you to implement
a website with functionality typically associated
with a CMS/e-commerce site.

you can download it here for free-
asp.net/downloads/starter-kits/
then select the-beer-house

for more starter kits keep seeing mu next posts.