There are few free ecommerce  solutions and free content management solutions like:

Ecommerce Solutions/Shopping Carts-

1) Oscommerce: Please visit oscommerce.com for more details.

2) Prestashop: Visit prestashop.com .Its very fast modules,you can easily configure any module without knowledge of coding.

3) Zencart

4) Cubecart

All the above are free ecommerce solutions,you can easily install them and your shopping cart is ready.

CMS: Wordpress (wordpress.org) is the best possible cms solution/blog available,some features

1) Easily add/edit/delete pages/posts/categories/tags

2)Add widgets

3) Add videos

4) Highly SEO friendly

If you need any help in installing any of the above please contact us.