26. Peter’s Login Redirect
Redirect users to different locations after logging in and logging out. http://wordpress.org/extend/plugins/peters-login-redirect/
Add a classified ads section to your WordPress site, quickly and easily.
Very easy to use Simple WordPress Paypal Shopping Cart Plugin. Great for selling products online in one click from your WordPress site. http://wordpress.org/extend/plugins/wordpress-simple-paypal-shopping-cart/
29. Query Posts
A WordPress widget that gives you unlimited control over showing posts and pages.
Self hosted WordPress chat plugin supporting private chat, chat rooms, avatars, user list, words filtering, smilies, caching plugins and more. http://wordpress.org/extend/plugins/quick-chat/
Theme Options UI Builder for WordPress. A simple way to create & save Theme Options and Meta Boxes for free or premium themes. http://wordpress.org/extend/plugins/option-tree/
Adds a WYSIWYG widget based on the standard TinyMCE WordPress visual editor.
Allow your visitors to comment and login with social networks like Twitter, Facebook, Paypal, LinkedIn, LiveJournal, OpenID, Google, Yahoo. http://wordpress.org/extend/plugins/oa-social-login/
Magic Floating Sidebar Maker, makes your blog sidebar floatable so it floats down as your visitor scrolls.
Search Meter tracks what your readers are searching for on your blog. View full details of recent searches or stats for the last day, week or month. http://wordpress.org/extend/plugins/search-meter/
WPtouch: A simple, powerful and elegant mobile theme for your website. http://wordpress.org/extend/plugins/wptouch/
WP Customer Reviews allows your customers and visitors to leave reviews or testimonials of your services. Reviews are Microformat enabled (hReview). http://wordpress.org/extend/plugins/wp-customer-reviews/
A powerful real-time web analytics plugin for WordPress. http://wordpress.org/extend/plugins/wp-slimstat/
This plugin extends the functionality of custom fields. http://wordpress.org/extend/plugins/custom-field-template/
40. Custom Post Type UI
Admin UI for creating custom post types and custom taxonomies in WordPress.
Easily post syntax-highlighted code to your site without having to modify the code at all. As seen on WordPress.com. http://wordpress.org/extend/plugins/syntaxhighlighter/
The #1 Print and PDF button for your WordPress site. Printer Friendly pages without coding, css, or print.css. Fast, easy, and professional. http://wordpress.org/extend/plugins/printfriendly/
Lets you edit the WordPress admin menu. You can re-order, hide or rename menus, add custom menus and more. http://wordpress.org/extend/plugins/admin-menu-editor/
Duplicate, clone, backup, move and transfer an entire site from one location to another in 3 easy steps.
Slick social share buttons adds facebook, twitter, google +1, linkedin, digg, delicious, reddit, stumbleupon, buffer and pinterest pin it social media. http://wordpress.org/extend/plugins/slick-social-share-buttons/
The Editorial Calendar makes it possible to see all your posts and drag and drop them to manage your blog. http://wordpress.org/extend/plugins/editorial-calendar/
The easy way to start earning money from video content. Coull Vidlinkr turns every YouTube video on your website into a revenue stream within minutes. http://wordpress.org/extend/plugins/vidlinkr/
48. Wordfence Security
Wordfence Security is a free enterprise class security plugin that includes a firewall, virus scanning, real-time traffic with geolocation and more. http://wordpress.org/extend/plugins/wordfence/
Edit content inline, without going to the admin area. http://wordpress.org/extend/plugins/front-end-editor/
50. P3 (Plugin Performance Profiler)
See which plugins are slowing down your site. This plugin creates a performance report for your site.