All in one SEO Pack
All in one SEO Pack plugin is easy to use and is compatible with most WordPress plugins. It works as an overall SEO plugin – automatically generating META tags and optimizes your titles for search engines and helps you in avoiding duplicate content.
Google XML Sitemaps
Google XML Sitemaps plugin will generate a special XML sitemap which will help search engines like Google, Bing, Yahoo and Ask.com to better index your blog. With such a sitemap, it’s much easier for the crawlers to see the complete structure of your site and retrieve it more efficiently. The plugin supports all kinds of WordPress generated pages as well as custom URLs. Additionally it notifies all major search engines every time you create a post about the new content.
Sitemap Generator Plugin for WordPress
Sitemap Generator Plugin plugin creates a sitemap for your WordPress powered site. This is not just another XML sitemap plugin, but rather a true sitemap generator which is highly customizable from its own options page in the WordPress admin panel. Some of its features include: support for multi-level categories and pages, category/page exclusion, multiple-page generation with navigation, permalink support, choose what to display, what order to list items in, show comment counts and/or post dates, and much more.
Redirection
Redirection is a WordPress plugin to manage 301 redirections, keep track of 404 errors, and generally tidy up any loose ends your site may have. This is particularly useful if you are migrating pages from an old website, or are changing the directory of your WordPress installation.
Automatic SEO Links
Forget to put manually your links, just choose a word and a URL and this plugin will replace all matches in the posts of your blog. For each link, you can set Title, Target, Rel.
AddToAny: Share/Bookmark/Email Button
The WordPress plugin to help people share, bookmark, and email your posts and pages using any service, such as Facebook, Twitter, Google Buzz, Digg, Delicious, and well over 100 more sharing and social bookmarking sites. New: Facebook Like Button and Twitter Tweet Button.
SEO Friendly Images
SEO Friendly Images is a WordPress SEO plugin which automatically updates all images with proper ALT and TITLE attributes for SEO purposes. If your images do not have ALT and TITLE already set, SEO Friendly Images will add them according the options you set. Additionally this makes the post W3C/xHTML valid as well.
SEO Slugs
The SEO Slugs WordPress plugin removes common words like ‘a’, ‘the’, ‘in’ from post slugs to improve search engine optimization. Slugs are long filenames assigned to your posts. Ex: http://yourblog.com/what-you-can-do-immediately-for-higher-rankings
HeadSpace 2
HeadSpace is a powerful all-in-one plugin to manage meta-data and handle a wide range of SEO tasks. With it you can tag your posts, create custom titles and descriptions that improve your page ranking, change the theme or run disabled plugins on specific pages, and a whole lot more.
SEO Smart Links
SEO Smart Links provides automatic SEO benefits for your site in addition to custom keyword lists, nofollow and much more. SEO Smart Links can automatically link keywords and phrases in your posts and comments with corresponding posts, pages, categories and tags on your blog. Further SEO Smart links allows you to set up your own keywords and set of matching URLs. Finally SEO Smart links allows you to set nofollow attribute and open links in new window.