SEO Plugins for Wordpress
Wordpress is a powerful content management system and it brings many advantages for search engine optimization. You can power up your SEO with fine-tuning your default options and also with the help of some useful SEO plugins.
I will try to list some of the useful plugins for you to check and use the ones meet your needs.
Google (XML) Sitemaps Generator for WordPress
This useful plugin generates a sitemap for your website that will let search engines to crawl and index your content easily. It supports custom URLs and notifies major search engines whenever the sitemap is updated after a post or a page you publish.
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Download Google (XML) Sitemaps Generator from Wordpress.Org
All in One SEO Pack
All in One SEO Pack is one of the most famous seo plugins for wordpress. It generates meta tags automatically, and lets you to override any title. You can set canonical URLs and fine-tune your navigational pages. The options interface comes with the plugin is pretty user friendly.
Download All in One SEO Pack Plugin Homepage on Wordpres.Org
HeadSpace2 SEO
This SEO plugin is an advanced user one which lets you to configure your meta tags for your posts, categories and pages. You can also set-up which parts of your website will be published on no-follow or no-index attributes. You can add javascript or CSS files to your posts
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Download HeadSpace2 SEO Plugin from Wordpress.Org
SEO Smart Links
This plugin lets you to automatically link the keywords and matching URLs in your posts and pages. You can also add no-follow attribute and target values for the link. This plugin briefly; looks for keyword phrases that match the titles of your posts and pages by default and turn them into links. For example: If you have a product name and if you want that product name linked to the product page automatically whenever it is written on a post or a page, SEO Smart Links make it automatically. Check the plugin’s author website for more detailed help.
Screenshot
Download SEO Smart Links from Wordpress.Org
Broken Link Checker
No need to mention how broken links might damage your website SEO wise. This plugin checks your posts and pages to find if there are any broken ones and notifies you on your dashboard if any. There is also some additional options such as reporting redirected links, and broken images which can be set in the plugin options page.
Download Broken Link Checker from Wordpress.Org
SEO Image
ALT and TITLE tags are important parts of your images for SEO purposes. They add information about the images in the code and lets search engines crawl the image successfully. This plugin lets you to automatically add ALT and TITLE tags to your images that hasn’t been set with these tags according to the options you specify in the plugin options page.
Download SEO Friendly Images from Wordpress.Org
Redirection
This plugin lets you to manage 301 redirections which is vital for your on site search engine optimization. It captures the broken / 404 links on your website and lets you to point them to 301 redirection. An additional option this plugin provides is you can also redirect any link in your website; not only the broken ones. This feature can be useful in some cases. It also keeps a full log of redirected pages which is helpful for you to keep the track of the actions.
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Download Redirection Plugin from Wordpress.Org
Additionals
Google Doc Embedder
This is a plugin that lets you embed PDF files, Powerpoint documents into your posts using the Google Doc Viewer. The good thing with this plugin is it doesn’t require any software installed on the visitors browser to view it.
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Download Google Doc Embedder from Wordpress.Org
WP Greet Box
This plugin automatically shows greeting messages in your homepage with referer URL the visitor directed to your website. The nice thing about this plugin is it suggests visitors to take actions related with the referers they are visiting your website. For example, if the visitor clicks a link on a twitter page and visits your website; this plugin generates a message telling the visitor to tweet that page and follow you on Twitter. There are also some other major services included to the referers list. You can also set a default welcome message ignoring any referer related messages.
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Download WP Greet Box from Wordpress.Org
Important Note: All plugins listed here are given download links to Wordpress.Org official website. Be careful when you are trying to download a plugin; make sure you are getting the file via wordpress.org or directly from the author’s website if trusted.

Reliable list I say. Actually, I am using most of them in one of my websites and as an experimental experience I uso none in another. I only set permalinks and stuff that comes default with Wordpress installation in that one. It ranks pretty well.
If you do the basics you should be OK without plugins that helps you to set meta tags and that. You need a content of course to support it.
The rest of the plugins that looks like seo tools are useful indeed such as broken link checker, redirection etc.