Back in the day, there were great features available to WordPress.com users that were not available on self-hosted WordPress installs. Jetpack is a plugin that connects to WordPress.com and enables awesome features, powered by their cloud infrastructure.

Jetpack itself is, and always will be free. Some individual features that Jetpack provides will be free, but others in the future may require payment. Installing Jetpack is free and requires no payment information.

Pricing: FREE
Requirements: WordPress 2.7+
Source: http://jetpack.me/

User Submitted Posts (USP) lets your visitors submit posts and images from anywhere on your site and from anywhere on the page. User-submitted posts optionally include tags, categories, post title, and author name & URL. Submitted-post status can be set to draft, publish immediately, or publish after some number of approved posts.

User Submitted Posts also handles multiple image uploads, custom URL redirects, and much more. And the easy USP Settings Page makes setting up and fine-tuning a breeze.

Pricing: FREE
Requirements: WordPress 2.7+
Source: http://perishablepress.com/user-submitted-posts/

The WP Mobile Detector WordPress plugin automatically detects if the visitor is using a standard mobile phone or a smart phone and loads a compatible WordPress mobile theme for each.

The WP Mobile Detector plugin also includes an installer that will configure everything automatically. All you have to do is install and activate the plugin.

Included in this plugin is the Jester Mobile, Anakin Mobile, Casper Mobile, Colbalt Mobile, Mojo Mobile, Viper Mobile, and Bluesteel Mobile advanced mobile themes, all featuring the jQuery framework. Impress your visitors with collapsible menus, dynamic page loading, cross-platform compatibility, touch-optimized layouts, widgets, and more.

Pricing: FREE
Requirements: WordPress 2.7+
Source: http://wordpress.org/extend/plugins/wp-mobile-detector/

You are looking for a fancy Slideshow to improve your Blog’s/Website’s Design? This is perfect for you! Front Slider includes as many Featured Posts as you like. You can define a Image for every Post. It shows an excerpt, date, time and number of comments for every Post. The text and images are sliding smoothly

Front Slider generates nice thumbnails through which can be slided and navigated. By clicking on the big image one gets directly to the featured Post.

Pricing: FREE
Requirements: WordPress 2.6+
Source: http://wordpress.org/extend/plugins/foursquare-integration/

The Postie Plugin allows you to blog via e-mail, including many advanced features not found in wordpress’s default post by e-mail feature. Postie offers many advanced features for posting to your blog via e-mail, including the ability to assign categories by name, included pictures and videos, and automatically strip off signatures. It also has support for both imap and pop3, with the option for ssl with both.

Pricing: FREE
Requirements: WordPress 2.3+
Source: http://wordpress.org/extend/plugins/postie/

CMS Tree Page View is a plugin for WordPress that adds a CMS-like tree overview of all your pages, like the view often found in a page-focused CMS. You can view and organize pages in a simple to use tree view. You can Add and Edit pages directly from the tree. You can also drag and drop to rearrange your pages easily.

Pricing: FREE
Requirements: -
Source: http://eskapism.se/code-playground/cms-tree-page-view/

FourSquare Integration shows your last Check-ins on your wordpress blog/posts and also in Sidebar. Foursquare is primarily for letting your friends know where you are and figuring out where they are. Secondarily, it’s for collecting points, prize “badges,” and eventually, coupons, for going about your everyday business.

Pricing: FREE
Requirements: WordPress 2.8+
Source: http://wordpress.org/extend/plugins/foursquare-integration/

Snow WordPress Plugin lets you create snowflakes (and more) falling down your blog! There are snowflakes, leaves, drops – and balloons that can float upwards. You can simply add more images in the pics folder and they will appear on the settings page.

You can configure the number of snowflakes and limit the plugin to specific posts or pages. If you enter something into the URI field you will only see snow if the URI of your page matches the string. No fancy regexps.

Pricing: FREE
Requirements: WordPress 2.1+
Source: http://wordpress.org/extend/plugins/nksnow/

Highlighter is WordPress plugin that allows publishers and readers to engage in more contextually-relevant conversations. They empower bloggers to increase their traffic, visitor interaction, email collections, and ultimately, how much money they make.

It has never been this easy for publishers and readers to engage in conversations on blogs. The visitor is no longer limited to leaving a comment at the very bottom of the page. It is now possible to have a conversation around a specific word, sentence or image.

Pricing: FREE
Requirements: -
Source: http://highlighter.com/

WP-Property is a Property and Real Estate Management Plugin for WordPress. Create a directory of real estate / rental properties and integrate them into you WordPress. This is not a “collection” of plugins, but one full suite. You will not have to download and match together a plethora of other plugins, in the hopes of them working well together, to have all the features you need.

Pricing: FREE
Requirements: WordPress 3.0+
Source: http://wordpress.org/extend/plugins/wp-property/