It’s a widely accepted fact that WordPress is the best blogging platform available currently. By using a few or all of the plugins below, you can effectively convert WordPress as a CMS.
Role Manager

WordPress has 5 roles for users and that makes sense for blogs. The Role Manager WordPress Plugin lets the you customize the roles and capabilities of your users. If your CMS has only one user, then this plugin is not required but it is must have for those with multiple users.
Download Role Manager
cforms II

cforms II is a highly customizable contact form plugin which can be used to create custom forms. Multiple forms can be created which makes this plugin a must have not just when you use WordPress as a CMS but when you use it as a blog too.
Download cforms II
Subscribe2

Subscribe2 is a WordPress plugin that allows readers to subscribe to posts via email. Subscribe2 can be configured to send emails on a per post, hourly, daily or weekly basis. In addition to all this, you can also send custom emails to all your subscribers.
Download Subscribe2
pageMash pageManagement plugin

pageMash plugin for WordPress has an Ajax interface that allows the user to drag-and-drop the pages into any order that he may choose and modify the page structures too and therefore is a must have if you intend to use WordPress as a CMS for your website.
Download pageMash
Search Everything WordPress Plugin

The Search Everything WordPress plugin increases the scope of the default WordPress search by searching pages, tags and so on. It makes sense to use this plugin not just for your WordPress based website but for your blog too.
Download Search Everything
CMS-like Admin Menu

The CMS-like Admin Menu plugin is a must have for those who intend to implement WordPress as a CMS for their website. The CMS-like Admin Menu plugin rewrites the Admin menu links for Write and Manage to default to using Pages instead of posts, while leaving the ability to deal with posts intact.
Download CMS-like Admin Menu
All in One SEO Pack

The All in One SEO Pack plugin for WordPress needs no introduction for WordPress users. This plugin allows you to edit Description and Keywords meta tags for both individual pages as well as posts.
Download All in One SEO Pack
Simple CMS WordPress Plugin

The Simple CMS WordPress plugin converts WordPress into a basic CMS by removing all the complicated blogging functionalities which is not needed for a basic static website.
Download Simple CMS
Admin Management Xtended Plugin

The Admin Management Xtended WordPress plugin allows you to manage your posts and pages very easily, without going to and fro the Manage and Write page. You can turn on/off any particular post/page, change the publication date and change the post/page title and so on.
Download Admin Management Xtended
WP e-Commerce

The WP e-Commerce plugin is the best e-Commerce cart plugin for those who want to sell products on their WordPress based website. It provides an easy to manage an e-commerce shop and integrates well with various payment gateways like Paypal, Google Checkout and Shipwire.
Download WP e-Commerce
WP-CMS Post Control Plugin

The WP-CMS Post Control Plugin allows you to customize the post and page options to a large extent. For example you can hide unwanted items like custom fields or trackbacks etc.
Download WP-CMS Post Control
Members Only

The Members Only WordPress plugin allows you to make your blog viewable to visitors only if they are logged in. If a visitor is not logged in, they will be redirected either to the WordPress login page or to a page of your choice. Once they log in, they will be redirected back to the page that they had originally requested.
Download Members Only
Redirection

Redirection helps you manage 301 redirections, keep track of 404 errors, and tidy up any loose ends your site is likely to have. This plugin is extremely useful if you are migrating pages from an old website, or if you are changing the directory of your WordPress CMS installation.
Download Redirection
Google XML Sitemap Generator

Like the All In One SEO Pack plugin, the Google XML Sitemap Generator plugin is applicable for both blogs as well as websites which use WordPress as a CMS. This plugin will create a Google compliant XML-Sitemap of your WordPress blog or website. It supports all WordPress generated pages including custom ones. Each time you edit or create a post, your sitemap is updated and all major search engines such as ASK, Google, MSN Search and Yahoo! are notified about the update for indexing purposes.
Download Google XML Sitemap Generator
BM Custom Login Plugin

This plugin helps you create an easy way to add a custom WordPress login screen. This is very useful for web developers who use WordPress as a CMS for their clients.
Download BM Custom Login Plugin
Secure Files

This Secure Files plugin allows you to upload and download documents that are stored outside of your web document root for security purposes.
Download Secure Files
TinyMCE Advanced

The TinyMCE Advanced Plugin adds 15 other buttons or plugins to the TinyMCE - Advanced hr, Advanced Image, Advanced Link, Context Menu, Emotions(Smilies), Date and Time, IESpell, Layer, Nonbreaking, Print, Search and Replace, Style, Table, Visual Characters and XHTML Extras.
Download TinyMCE Advanced
Exec-PHP

The Exec-PHP plugin helps you execute custom PHP code in posts, pages and text widgets.
Download Exec-PHP
Maintenance Mode Plugin

The Maintenance Mode plugin adds a splash page to your blog that lets visitors know that your blog is down for maintenance. However, logged-in administrators get full access to the blog including the front-end. When activated, it gives a splash message as above. This plugin is another must have for both blogs as well as websites and can be put to use when you are updating your pages or your WordPress installation.
Download Maintenance Mode plugin
Bonus: Launchpad WordPress Theme

Launchpad is a WordPress Theme with a difference. If you are about to launch a new blog or website, then this theme offers a professional parked page. Copy and paste the theme files into your WordPress theme directory, sign up for FeedBurner with email subscriptions and you’re done! Your professionally designed parking page that serves an RSS feed link and a form for email updates is ready for free!
Download Launchpad Theme for WordPress
Have I missed out on any plugins? Comment and let me know!
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