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/

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.

Redirection uses three core concepts: Modules, Groups and Redirects. A module consists of many groups, and each group consists of many redirections. A module determines how the redirections will be used, and a group allows you to separate redirections into logical units. A redirection represents an action performed when a particular URL is accessed.

Pricing: Free
Requirements: WordPress 2.6+
Source: http://urbangiraffe.com/plugins/redirection/

The WP e-Commerce plugin is a fully integrated shopping cart application suitable for selling your products, services, and or fees online. WP e-Commerce makes it easy for you to accept payments online. WP e-Commerce integrates with Google Checkout, Paypal, Authorize.net, Payment Express and many other trusted payment processors.

You will install WP e-Commerce in minutes. Just like all well architectured plugins WP e-Commerce bolts right on. You simply download the plugin, copy it to your Plugins folder and activate it via your admin panel.

Pricing: Free
Requirements: WordPress 2.5+
Source: http://www.instinct.co.nz/e-commerce/

The WordPress Simple Paypal Shopping Cart is a very easy to use plugin that allows you to sell products or services online in one click from your WordPress blog. It lets you add the ‘Add to Cart’ button anywhere on any post or page. This plugin also allows you to add the shopping cart anywhere in a post or page or sidebar easily. The shopping cart shows the user what they currently have in the cart and allows them to add or remove items.

After the Payment has been processed by PayPal the customer will be redirected to a page (you can set your desired target page URL from the options menu of this plugin) where the customer can see download link of the product or instructions or a simple thank you etc.

Pricing: Free
Requirements: WordPress 2.5+
Source: http://www.tipsandtricks-hq.com/wordpress-simple-paypal-shopping…

Many blogs out there can only produce a couple articles a week while their visitors ask for loads more. It’s sometimes a good idea to add related articles from other blogs to your sidebar. Adding them manually takes lots of time we don’t have.

With this new Community News plugin you allow your visitors to add articles to the sidebar. Complete with moderation panel and a settings page, you can sit back while you have full control about the look and articles that being posted.

Pricing: Free
Requirements: -
Source: http://www.frank-verhoeven.com/wordpress-plugin-fv-community-news/

Zemanta is a revolutionary new platform for accelerating on-line content production for any web user. Any user-created text (a blog post, article or web page) is directly “read” by Zemanta, which recognizes all contextual content. Zemanta then combs the web for the most relevant images, smart links, keywords and text, instantly serving these results to the user to enrich and inform their content. What’s more, Zemanta can be deployed on all major content publishing platforms and web browsers through a simple plug-in.

Simple point & click enrichment of your blog posts (and emails). In real-time, while you type. They suggest tags, links, photos, and related articles. You save time and aspirin.

Source: http://www.zemanta.com/

Snazzy Archives is a visualization plugin for your WordPress site featuring an unique way to display all your posts. Your archive page will never be boring again. Snazzy Archives simply lets you express yourself and your blog. You can select different layouts and special effects, Snazzy archives will make sure your content stands out.

Pricing: Free
Requirements: -
Source: http://www.prelovac.com/vladimir/wordpress-plugins/snazzy-archives

GD Star Rating plugin allows you to set up rating system for posts, pages and comments in your blog. You can set many options for displaying the rating stars, and also add widgets into the sidebars for displaying top ratings and other statistics generated by the plugin. Plugin includes advanced settings panels that will allow you to control many aspects of rating.

Multi rating is almost completed. You can check out Multi Sets panel where you can build multi rating sets. Each element of the set has different weight for calculating overall rating. Each post can have one instance of each rating set, and sets will support almost everything regular rating supports.

Pricing: Free
Requirements: -
Source: http://www.gdstarrating.com/

Anarchy Media Player 2.5 for WordPress, WordPressMu and Standalone Javascript will play any simple href link to mp3, flv, Quicktime mov, mp4, m4v, m4a, m4b, 3gp as well as Windows wmv, avi and asf files, in the appropriate player on your web page.

The WordPress versions also add buttons to the Rich Text Editor for embedding Flash swf and Director dcr movies as well as YouTube, Google Video, iFilm, DailyMotion, Revver, Metacafe, MySpace, Apple iTunes iMix, and GoEar players.

Various options are available in config.php, including enabling both the Director editor button and wysiwyg extensions to the rich text editor (latter disabled by default as it may conflict with other wysiwyg plugins in some installs). Config.php also allows download links to be turned on or off, restrict use of the script to your domains, change the colour styling of the mp3 player, set site Quicktime version, video player sizes and so on.

Pricing: Free
Requirements: -
Source: http://an-archos.com/anarchy-media-player