Akismet
Used by millions, Akismet is one of the best ways to protect your blog from comment and trackback spam.

AWeber Footer SlideUp
Footer Slideup adds a subscribe form in the footer of your WordPress blog.

Contact Form Plugin
Plugin for Contact Form.

Facebook
Add Facebook social plugins and the ability to publish new posts to a Facebook Timeline or Facebook Page. Official Facebook plugin.

FB LinkedIn Resume
Publish all your LinkedIn public profile (or just some selected parts) on your blog.

Floating Social Media Icon
An easy-to-use plugin to show social media icons that float to the right bottom of your browser. It adds links to your social media profiles. If you upgrade to paid version, you can add customized icons.

Floating Social Media Popout
Floating Social Media popout allows your webpage to show a facebook box and Googleplus badge widget when a visitor mouse hovers the floating face book icon or Googleplus icon located on right side of webpage.

Footer Putter
Put a footer on your site that boosts your credibility with both search engines and human visitors.

Print Friendly and PDF
PrintFriendly & PDF button for your website. Optimizes your pages and brand for print, pdf, and email.

Scrolling Social Sharebar (Twitter Like Google +1 Linkedin and Stumbleupon)

SiteWit
SiteWit is the most advanced Pay Per Click (PPC) management software for your search engine marketing efforts.

Social Media Icons Widget
Plugin/Widget for Social Media Icons

Testimonial Basics
This plugin facilitates easy management of customer testimonials. The user can set up an input form in a page or in a widget, and display all or selected testimonials in a page or a widget. The plug in is very easy to use and modify.

Ultimate Coming Soon Page
Creates a Coming Soon or Launch page for your website.

UppSite – Go Mobile™
UppSite is the best way to make your site mobile.

Velvet Blues Update URLs
This plugin updates all urls in your website by replacing old urls with new urls.

WordPress Popular Posts
Showcases your most popular posts to your visitors on your blog’s sidebar. Use WordPress Popular Posts as a widget or place it anywhere on your theme using shortcodes.

WordPress Portfolio Plugin
A plugin that allows you to show off your portfolio through a single page on your wordpress blog with automatically generated thumbnails. To show your portfolio, create a new page and paste [wp-portfolio] into it. The plugin requires you to have a free account with Shrink The Web to generate the thumbnails.

WP Editor
This plugin modifies the default behavior of the WordPress plugin and theme editors.

Ad Injection
Injects any ad (e.g. AdSense) into your WordPress posts or widget area. Restrict who sees the ads by post length, age, referrer or IP. Cache compatible.

AdSense on Top
Shows Adsense Ad on Top, Bottom, right or left Margin of Window. Only works together with the wonderful Adsense-Optimizer Plugin.

Adsense Optimizer
Ads Google Adsense ads automatically to your blog.

Advanced WordPress Theme Editor
This plugin provides an enhanced experience when editing your Theme directly from WordPress. It provides code formatting and highlighting at least for PHP, CSS and JS files.

Comment Rating Field Plugin
Adds a 5-star-rating field to the comments form in WordPress. Requires WordPress 3.0+

Comment Rating Widget
Display Comment Rating along with the most recent comments/trackbacks in the sidebar.

delicious-plus widget
Adds a sidebar widget to display delicious links

DK New Media’s Image Rotator Widget
A sidebar widget for rotating images utilizing jQuery.

EasyRotator for WordPress
Add professional, customizable photo sliders to your site in seconds.

Facebook, Twitter, Google Plus One social share buttons for WordPress
With this widget , you can display a customizable jQuery accordion which gathers Facebook social plugins together on your WordPress website .

Facebook Button Plugin
Puts Facebook Button in to your post.

Favorite Plugins Widget
Show your favorite plugins from your WordPress.org profile along with author and star ratings.

HL Twitter
A plugin to display and store your Twitter archive and send out new tweets on publish.

JF3 Maintenance Redirect
This plugin allows you to specify a maintenance mode message/page for your site as well as configure settings to allow specific users to bypass the maintenance mode functionality in order to preview the site prior to public launch, etc.

Lazy Load
Lazy load images to improve page load times. Uses jQuery.sonar to only load an image when it’s visible in the viewport.

LinkedIn SC
Display your LinkedIn CV on one of your WordPress pages or post using Shortcodes

Magn Drag and Drop Upload
This plugin will help you to drag and drop images directly in your New Post page. Saves 90% of time while uploading images.

Options Framework
A framework for building theme options.

Photo Galleria
Creates beautiful slideshows from embedded WordPress galleries.

Pinterest Pinboard Widget
Add a Pinterest Pinboard widget to WordPress.

Portfolio Post Type
Enables a portfolio post type and taxonomies.

Portfolio Slideshow
An easy-to-use, mobile-friendly slideshow for WordPress.

Random Image
Displays a Random Image from the Post Attachment Gallery/ Page Attachement Gallery / Custom Media Library Items. Easy Implementing Shortcode is available.

Rotating Header
Create a rotating header similar to how the built-in WP 3.0 header works but for multiple images that rotate at a set interval.

Rotating Image Widget
Create a jQuery-driven rotating image sidebar widget.

Slideshow
The slideshow plugin is easily deployable on your website. Add any image that has already been uploaded to add to your slideshow, add text slides, or even add a video. Options and styles are customizable for every single slideshow on your website.

WOW Slider
This module easily adds image sliders created with WOWSlider app.

WP Simple Paypal Shopping cart
Simple WordPress Shopping Cart Plugin, very easy to use and great for selling products and services from your blog.