The basic install of WordPress has many useful options, but the true power of the CMS comes from it’s ability to be extended to do almost anything. If you need a poll, stock images, social media integration, or well, almost anything, WordPress can do it. Check out these useful plug-ins. Find out what you can do with your site.

W3 Total Cache

Improve site performance and user experience via caching: browser, page, object, database, minify and content delivery network support.

WP Super Cache

This plugin generates static html files from your dynamic WordPress blog. After a html file is generated your webserver will serve that file instead of processing the comparatively heavier and more expensive WordPress PHP scripts.

WP Smush.it

Reduce image file sizes and improve performance using the Smush.it API within WordPress.

Tweet, Like, Google +1 and Share

A very simple social share plugin with just 5 social icons (Twitter, FB Like, Google +1, Linkedin and FB Share)

Customize RSS

Add links, copyrights or whatever you want to feed content.

Make Your Site Social

Increase your site registration and engagement by integrating Gigyas social optimization service into your WordPress site.

SexyBookmarks | email, bookmark, and share buttons

Adds an attractive social bookmarking menu to your posts, pages, index, or any combination of the three.

WP to Twitter

Posts a Twitter update when you update your WordPress blog or post to your blogroll, using your chosen URL shortening service. Requires PHP 5 and cURL

Digress.it

Digress.it lets you comment paragraph by paragraph in the margins of a text

WordPress Wiki

Add Wiki functionality to your WordPress site.

WP Mobile Detector

WP Mobile Detector automatically detects standard and advanced mobile devices and displays a compatible WordPress mobile theme.

WPtouch

WPtouch automatically transforms your WordPress blog into an iPhone application

Akismet

Akismet checks your comments against the Akismet web service to see if they look like spam or not.

All in One SEO Pack

Automatically optimizes your WordPress blog for Search Engines (Search Engine Optimization).

Google XML Sitemaps

This plugin will generate a special XML sitemap which will help search engines to better index your blog.

Scissors Continued

Scissors Continued enhances WordPress’ handling of images by introducing cropping, resizing, rotating, and watermarking functionality.

NextGEN Gallery

NextGEN Gallery is a fully integrated Image Gallery plugin for WordPress with dozens of options and features.

Google Analyticator

Adds the necessary JavaScript code to enable Google Analytics. Includes widgets for Analytics data display.

Google Analytics for WordPress

Track your WordPress site easily and with lots of metadata: views per author & category, automatic tracking of outbound clicks and pageviews.

Organize Series

A plugin for managing the article series you write.

WordPress.com Stats

Simple, concise stats with no additional load on your server.

Yet Another Related Posts Plugin

Display a list of related entries on your site and feeds based on a unique algorithm. Templating allows customization of the display.

TinyMCE Advanced

Enables the advanced features of TinyMCE, the WordPress WYSIWYG editor.

MapPress Easy Google Maps

MapPress is the most popular and easiest way to create great-looking Google Maps and driving directions in your blog.

Broken Link Checker

This plugin will check your posts, comments and other content for broken links and missing images, and notify you if any are found.

Post Ideas

Keeps track of all your blog article or post ideas including a working title, possible keywords, source links and descriptions.

MediaElement.js – HTML5 Video & Audio Player

MediaElement.js is an HTML5 video and audio player with Flash fallback and captions. Supports IE, Firefox, Opera, Safari, Chrome and iPhone, iPad, and Andriod.

FeedWordPress

FeedWordPress is an Atom/RSS aggregator for WordPress. It syndicates content from feeds that you choose into your WordPress weblog.

WP-Polls

Adds an AJAX poll system to your WordPress blog. You can also easily add a poll into your WordPress’s blog post/page.

Google Doc Embedder

Lets you embed MS Office, PDF, and many other file types in a web page using the Google Docs Viewer (no Flash or PDF browser plug-ins required).