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The best is SEO Ultimate. Plenty features no other have. Trust me numbers on image attached are from real store.
SEO Ultimate was applied in the 1st August 2013. So You can see how its performing on screenshot below
Please add the following module to SEO list as “must have” especially when you have multiple categories for same product and you have different links for same product, one with category path and one without category path.
- One primary category for products which are there in multiple categories.
- Permanent redirects (301) if you explicitly remove category path from the URL
- Permanent redirects (301) if you explicitly add non-primary category in the URL
- Primary category will be used in the URL for each and every section of the store including cross sells, up sells, relative products, basket link, search, advance search etc.
- It also resolves duplicate content issue problem for your site as search engines will find one unique url for each product instead of multiple urls
- This module can be completely disabled whenever required via system configuration in admin
Magento SEO Plus extension allows searching for products with the convenience.
Enable customers to easily search products on your site by popular search engines.
With this Magento SEO extension, customers are allowed to easily find products by tags.
Customers are able to see other items related to products in which they are interested on the product list page of the tag.
Magento SEO Plus extension provides an ability to view lists of popular tags and all tags.
Your customers are also able to comfortably search for products and purchase as items are filtered according to attributes.
Allow using URL rewrite when searching on the site.
Allow using URL rewrite for pages listing products assigned to tags.
Allow using URL Rewrite and Cache Rewrite for Product Navigation.
Enable to use cache rewrite when loading Popular Search Terms page, lists of Popular Tags block and All Tags page.
Ability to set the prefix and suffix of the rewritten URL for the search result page, the tagâs product list page.
Ability to customize the patterns to operate filters by attributes on the rewritten URL.
Our Magento SEO extension allows using the canonical link to link the filter page to the main page.
Able to customize templates to generate the title, meta keywords, meta description for the search result page, the tagâs product list page and the navigation filter page.
Magento SEO Plus extension is Open source 100%.
License Certificate valid for 1 live Magento installation and unlimited test installations (No license key required).
Easy to install and configure.
Advanced SEO Suite by Mirasvit allows you to optimize the specific categories and product groups for specific search terms on a template, which will greatly improve the performance of your store in search engines (Google, Yahoo, Bing, etc).
There are two extension that i would suggest to have a look at, these are considered as much have SEO extensions
Canonical URLs - FREE - Magento by default creates multiple urls for one product page. As per Google guidelines you need to set 301 redirect or canonical tags for all.
Rich Snippet - To highlight products in Google SERPS to attract more traffic.