There are many mods available for making your shopping portals more SEO Friendly. Here are some of them:

1.   Default SEO Friendly option in Oscommerce converts the site into bit seo friendly mode but the URL’s are not easy to remember, here is the option for that:

Use Search-Engine Safe URLs (still in development) – Enable this option to True and the final Result which comes is www.yourshop.com/product_info?products_id=1 which is indexed by all Search Engines.

 

2.   Apache + PHP URL Rewriting – This is a mod in Oscommerce where in you can convert URL’s using Apache URL Rewriting Engine and PHP HTTP Redirection.

Example : http://www.yourshop.com/product_info.php?cPath=3_10&products_id=13

is converted to 

http://www.yourshop.com/en/dvd-movies/action/lethal-weapon.html

Download link to Mod

 

3.   Another SEF URL contribution – Uses mod_rewrite to map URLs of the form http://domain.com/catalog/Product+Name to the actual product info page or something like http://domain.com/catalog/Category+Name/Subcategory+Name/Manufacturer+Name to the appropriate index page.

Download link to YASU Mod

 

4.   Search Engine Optimization (SEO) - Advanced URLs for osCommerce – This is a very advanced mod and cannot be done by just replacing some lines of codes.Recommend only for advanced programmers only.

Download link to Mod

 

5.   SEF Link Transformer – This mod converts all links to search Engine friendly URL’s

Download link to Mod

 

6.   NIMMIT SEF – This Oscommerce Mod will convert URL in the following ways -

Normal -

http://www.yoursite.com/product_info.php?cPath=54&bla=bla&bla=bla

Standard Sef -

http://www.yoursite.com/product_info.php/cpath/54/bla/bla/bla/bla

to -
http://www.yoursite.com/product/some_product.html – or…
http://www.yoursite.com/brand/nice_brand.html – or…

http://www.yoursite.com/contact_us.html

 

7.   Ultimate SEO URL’s – This Mod will give the store owner the choice of the v1.X style cName or new v2.X style static HTML file.

Download link to Mod

(source: http://www.amitbhawani.com)