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Here is the list of best 10 WordPress SEO plugins. These plugins are note placed according to their rank and all 10 plugins are their own special importance mentions before them.

1.All in One SEP Pack

(Alternative to Platinum SEO Pack /SEO Ultimate /Themes built-in SEO options)
If you are on WordPress then you will come to know the importance of All in ONE SEO pack, the giant SEO plugin and all other plugins and themes have copied the features of this great WordPress SEO plugin. All in SEO plugin is the best and oldest SEO plugin for WordPress. This plugin provides a complete solution for WordPress SEO.
Top features of All in One SEO Plugin

• Custom titles and title rewriting for posts and homepage
  
• Automatic meta keyword and description generator
  
• Robots meta control such as custom index/follow meta tags

+ Many other awesome features

2.Platinum SEO Pack

(Alternative to All in One SEO /SEO Ultimate /Themes built-in SEO options)
It is plugin which follows All in One SEO and you will find all All in One SEO features in it. There are some extra features in this plugin such as 301 redirect for 404 permalink errors and nofollow to category and tag archives. If you are using All in One SEO then you can import its features to Platinum SEO pack.

SEO Ultimate

(Alternative to Platinum SEO Pack /All in One SEP Pack/Themes built-in SEO options)
SEO Ultimate is really an ultimate SEO plugin and this monster SEO plugin contains highly advanced features for SEO optimization of WordPress. Like All in One SEO plugin it contains keyword and meta description editor.
Top Features of SEO Ultimate Plugin

• Meta keyword and description editor
  
• Link masking ( important to mask bad links)
  
• Automatic internal linking

SEO Friendly Images

This plugin is aimed to optimize specially blog post images for Google image search. This plugin can add automatic alt tag and title to post images.

Robots Meta

Robots meta is a super duper plugin to control search bots for WordPress website. Using this plugin you can control indexing and following of a web page in your website. You can also edit robots.txt and .htaccess file direct from plugin panel. Besides you can also add verification meta tags for different search engines such as Google,Yahoo,Bing etc.
Note- All these plugin are available on WordPress fully free and you can search and install these plugin
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Best SEO plugins for WordPress
Updated list of top WordPress plugin 2011