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. Everything happens completely transparent, and you can edit the options from the administration settings panel.

Pricing: Free
Requirements: WordPress 2.7
Source: http://wordpress.org/extend/plugins/seo-automatic-links/

Sociable automatically add links to your favorite social bookmarking sites on your posts, pages and in your RSS feed. You can choose from 99 different social bookmarking sites (including Digg, Delicious, Facebook, Mixx, Sphinn and a lot more). It has nofollowed attribute on all links.

Pricing: Free
Requirements: WordPress 2.6+
Source: http://wordpress.org/extend/plugins/sociable/

Contact Form 7 is just another contact form plugin. Simple but flexible. It can manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on. You should also look at cform which is offering convenient deployment of multiple contact forms throughout your blog as well.

Pricing: Free
Requirements: WordPress 2.5+
Source: http://wordpress.org/extend/plugins/contact-form-7/

The dotMobi WordPress Mobile Pack is a complete toolkit from dotMobi to help mobilize your WordPress site and blog. It includes a mobile switcher to select themes based on the type of user that is visiting the site, a selection of mobile themes, extra widgets, device adaptation and a mobile administration panel to allow users to edit the site or write new posts when out and about.

The pack has been tested on WordPress 2.5, 2.6, and 2.7. Please note that the plugin requires you to be running WordPress on PHP v5.0 or greater.

Pricing: Free
Requirements: WordPress 2.5+
Source: http://mobiforge.com/running/story/the-dotmobi-wordpress-mobile-pack

Sometimes, links get broken. Most likely many of your blog posts contain links. It is almost inevitable that over time some of them will lead to a “404 Not Found” error page. Obviously you don’t want your readers to be annoyed by clicking a link that leads nowhere. You can check the links yourself but that might be quite a task if you have a lot of posts. You could use your webserver’s stats but that only works for local links.

Broken Link Checker is a plugin for WordPress that will check your posts (and pages), looking for broken links, and notifies you on the Dashboard if any problems are found. By default all old posts/links are re-checked every 72 hours, or you can set a different time period.

There are several buttons for each broken link – “Details” shows more info about why the link is considered “broken”, “Edit Post” does exactly what it says and “Discard” will remove the message about a broken link, but not the link itself (so it will show up again later unless you fix it). Use “Unlink” to actually remove the link from the post. If references to missing images are found, they will be listed along with the links, with “[image]” in place of link text.

Pricing: Free
Requirements: WordPress 2.0.2+
Source: http://wordpress.org/extend/plugins/broken-link-checker/

Featured Content Gallery is a WordPress plugin that creates an automated rotating image gallery of your posts or pages for use anywhere within your theme.

Completely customizable, the Featured Content Gallery is very easy to integrate. Choose to automate the plugin and simply add a custom field to each post or page you want to display and the gallery will show the image, an auto-generated thumbnail in the upper carousel, and the title and first few lines of page/post text. Advanced options allow inclusion of custom thumbnail images, custom text, and custom gallery styles and transitions.

Pricing: Free
Requirements: WordPress 2.7+
Source: http://www.featuredcontentgallery.com/

FlippingBook Wordpress Gallery is an excellent way of working with images in blogs. You download photos, and the plugin creates a small photo gallery out of them. If you need to post several pictures, you don’t have to make large posts. Being joint together, pictures can be put in a beautiful album-book and don’t take up much space.

It’s very convenient to look through the pictures, leafing through the pages. You just have to double-click to print images out. This is a real interactive book which is nice and easy to use when you turn its pages.

Pricing: €0 – €299
Requirements: WordPress 2.5+
Source: http://pageflipgallery.com/

TDO Mini Forms plugin allows you to add highly customisable forms that work with your Theme to your website that allows non-registered users and/or subscribers (also configurable) to submit posts. The posts are kept in “draft” until an admin can publish them (also configurable).

It can optionally use Akismet to check if submissions are spam. TDO Mini Forms can be used to create “outside-the-box” uses for Wordpress, from Contact Managers, Ad Managers, Collaborate Image Sites, Submit Links, etc.

The plugin provides an extensive moderation view so administrators and editors can see posts awaiting approval and publish or delete them. Administrators can also ban specific users and IPs from using the form. Registered users have access to a “Your Submissions” page which lists their current submissions awaiting approval and links to their approved submissions as well.

Pricing: Free
Requirements: WordPress 2.7+
Source: http://wordpress.org/extend/plugins/tdo-mini-forms/

WPML is a WordPress plugin that can turn any WordPress or WordPressMU site into a full featured multilingual content management system. WPMU can do this without any hacks and without breaking anything.

It can be configured to serve different subdomains or different sites in folders. Each blog in the WPMU install will serve a different language. Each blog will run in a single language and function as a standard WordPress blog.

You will be able to select the language for different pages, posts, categories and tags. Add translations to everything. Run your site from a single domain with language folders (example.com, example.com/es, example.com/de) or from different domains. You can also select your admin language.

Pricing: Free
Requirements: WordPress 2.6+ and requires PHP5.
Source: http://wpml.org/

MobilePress is a WordPress plugin that will render your WordPress blog on mobile handsets, with the ability to use customized themes. The plugin also allows specific themes for specific devices / mobile browsers, such as iPhone, Opera Mini, Windows CE Mobile and other generic handset browsers.

The plugin also allows WordPress theme developers to create custom mobile themes for WordPress blogs using the MobilePress plugin. Therefore, theme designers can create specific iPhone themes or generic themes.

MobilePress also features Mobile SEO which detects Google and Yahoo mobile search bots. These mobile search bots will see the mobile version of you blog which allows your blog to optimized and indexed on Google and Yahoo mobile search.

Pricing: Free
Requirements: -
Source: http://mobilepress.co.za/