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

With Apture, you can add multimedia to your blog with one click. You can use the Apture Media Hub to access multimedia from a range of sources all in one place — no more copy and pasting codes from different websites.

Apture suggests the most relevant content based on what other members of the Apture community have been linking, so you can find the most relevant content even faster. You can even resize the content intuitively by dragging from the bottom corner of any embedded item.

Until now, links have only allowed you to reference one thing at a time. But Apture let’s you link several different types of media together, so your readers can simultaneously see, hear, and read about a topic you care about.

Pricing: Free
Requirements: -
Source: http://www.apture.com/bloggers/

The Organize Series plugin helps with the organization and presentation of articles/posts you write as part of a series. It helps make it easier for readers of your blog to discover all the series you’ve written and also to easily find post that are part of the same series.

Organize Series actually adds a new taxonomy to the WordPress taxonomy structure so your blog would have “categories”, “tags”, and “series” as the taxonomy types.

Pricing: Free
Requirements: -
Source: http://unfoldingneurons.com/neurotic-plugins/organize-series-wordpress-plugin

WP-Invoice lets WordPress blog owners send itemized invoices to their clients. Ideal for web developers, SEO consultants, general contractors, or anyone with a WordPress and clients to bill. The plugin ties into WP’s user management database to keep track of your clients and their information.

Once an invoice is created from the WP admin section, an email with a brief description and a unique link is sent to client. Clients follow the link to your blog’s special invoice page, view their invoice, and pay their bill using PayPal. The control panel is very user-friendly and intuitive.

Pricing: Free
Requirements: -
Source: http://twincitiestech.com/services/wp-invoice/