Plugins can extend WordPress to do almost anything you can imagine. Here is a collection of best, popular and useful WordPress plugins.

1. WhyDoWork Adsense Plugin : WhyDoWork Adsense is a WordPress plugin that allows you to insert Adsense ads on your blog without modifying the template. More then that, you can set it up to show different Adsense ads for articles older then X days (x is the number of days you decide).
2. Akismet : Automattic Kismet (Akismet for short) is a collaborative effort to make comment and trackback spam a non-issue and restore innocence to blogging, so you never have to worry about spam again.
3. Google AdSense Widget : Monetizing your blog with Google AdSense has never been easier. Color, size, and title are all customizable from widget preferences. No coding or template modification required!
4. Exec-PHP : With Exec-PHP you can execute PHP code in the excerpt and the content portion of your posts and pages (in the following called articles) as also as in text widgets. To execute code, just type in the PHP code as you usually would, encapsulated in <?php ?> tags.
5. All in One SEO Pack : Optimizes your Wordpress blog for Search Engines (Search Engine Optimization).
6. WordPress.com Stats : provide statistics about your visitors. You can have simple, concise stats with no additional load on your server by plugging into WordPress.com’s stat system.
7. NextGEN Gallery : NextGEN Gallery is a full integrated Image Gallery plugin for WordPress with a Flash slideshow option.
8. cformsII - contact form : cforms is a highly customizable, flexible and powerful form builder plugin, covering a variety of use cases and features from attachments to multi form management, you can even have multiple forms on the same page!
9. Add to Any Share/Save/Bookmark Button : Helps readers share, save, and bookmark your posts and pages using any service, such as Delicious, Digg, Facebook, MySpace, and all the rest.
10. Wordpress Automatic upgrade : Wordpress automatic upgrade allows a user to automatically upgrade the wordpress installation to the latest one.
11. 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.
12. WP-DB-Backup : On-demand backup of your WordPress database.
13. ShareThis : ShareThis plugin allows users to add your post to many social bookmarking sites, or to send your post link via email, AIM, Facebook, MySpace and more.
14. AdSense Manager : AdSense Manager simplifies managing AdSense and other Ads Networks on your blog. It generates code automatically and allows positioning with widgets.
15. Popularity Contest Plugin : Popularity Contest is a WordPress plugin that uses page views and feedback (comments, trackbacks, etc.) to determine how popular each of your posts are (in relation to each other). The values given to each type of view and feedback are configurable and popularity for all posts is recalculated whenever they are changed.
16. Showoff Rankings : This widget provides a simple and elegant representation of your site’s rankings. Currently supported rankings are: Google PageRank, Alexa Traffic Ranking, Compete Snapshot Rank, Technorati Rank.
17. WP-EMail : Allows people to recommand/send your WordPress blog’s post/page to a friend.
18. wpSLEEP : wpSLEEP allows you to create posts in advance have them automatically publish when you’d like. You can then set when different parts of a post are viewable.
19. 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.
20. .html Wordpress permalink on PAGES : Appends .html to the URL of PAGES when using permalinks.
21. Download Counter : Keeps track of the amount of downloads of a certain file.Keeps track of the last download time. Allows you to reset the counter.Allows you to add counters to both internal and external urls etc.
22. KeywordLuv : Reward your commentators by separating their name from their keywords in the link to their website, giving them improved anchor text.
23. SmoothGallery : This plugin embeds JonDesign’s SmoothGallery into your posts and pages.
24. Yet another Ajax paged comments : This plugin provide Ajax enabled comments system with paging,posting and form validation to your WordPress blog.
25. Google (XML) Sitemaps Generator : This plugin generates a XML-Sitemap compliant sitemap of your WordPress blog. This format is supported by Ask.com, Google, YAHOO and MSN Search.

For more information and updates visit here.

Popularity: 82% [?]

Plugins/add-ons help your browser perform specific functions like viewing special graphic formats or playing multimedia files. Plugins are slightly different from extensions, which modify or add to existing functionality.

Here is a list of some best and useful firefox plugins/add-ons.

1. Firebug : Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
2. Adsense Notifier : Displays your Adsense earnings on the statusbar.
3. FireFTP : FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.
4. CoolPreviews : CoolPreviews (formerly known as Cooliris Previews) gives you the power to browse and share Web links and rich media faster. Just mouse over any link, and the preview window immediately appears to show you the content.
5. FlashGot : Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
6. Adblock Plus : Ever been annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page? Install Adblock Plus now and get rid of them.
7. Video DownloadHelper : The easy way to download and convert Web videos from hundreds of YouTube-like sites. This works also for audio and picture galleries.
8. Flash Video Resources Downloader : Download videos from Youtube, Google, Metacafe, iFilm, Dailymotion, Pornotube & all the rest of the popular online flash video sites.
9. WebShots : Webshots is a Firefox extension that allows you to capture screen shots of web pages. This is great for saving a specific page for future reference, sharing a web page with a friend, and more!
   
10. whos.amung.us Users Online Counter : Shows how many people are currently on your website.
11. Alexa Sparky : Sparky is a free Firefox browser plugin built by Alexa, that accompanies you as you surf, providing useful information about the sites you visit without interrupting your Web browsing.
12. WOT : WOT, Web of Trust, warns you about risky websites that try to scam visitors, deliver malware or send spam. Protect your computer against online threats by using WOT as your front-line layer of protection when browsing or searching in unfamiliar territory.
13. IE Tab : IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox.
    This is a great tool for web developers, since you can easily see how your web page displayed in IE with just one click and then switch back to Firefox.
14. StumbleUpon : StumbleUpon discovers web sites based on your interests, learns what you like and brings you more.
    
15. Firefox Universal Uploader : This extension allows to upload/download files from your favorite websites using a simple interface. Below is the list of all websites supported by Fireuploader.
16. TwitterFox : TwitterFox is a Firefox extension that notifies you of your friends’ status on Twitter.
    
17. Answers : 1-Click Answers TM will save you even more time with AnswerTips that instantly deliver the information you are looking for. Just point at any word, hold the Alt key (Ctrl in Linux) and click. Upon letting go, an AnswerTip in the form of a pop-up.
18. JSView : Allows you to locate and view the source code of external files like javascript files and css style sheets.
19. FireGestures : A customizable mouse gestures extension which enables you to execute various commands and user scripts with five types of gestures.
20. Fast Dial : Fast Dial replaces blank tabs with a panel of thumbnails of your favorite sites.
21. Web Developer : Adds a menu and a toolbar with various web developer tools.
22. iMacros : Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is
    the solution you’ve been dreaming of.
23. NoScript : The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
24. ScribeFire Blog Editor : ScribeFire is a full-featured blog editor that integrates with your browser and lets you easily post to your blog.
25. Roboform Toolbar : Add RoboForm Toolbar to Firefox. It is the top-rated Password Manager and Web Form Filler that completely automates password management and form filling.
    

For more information visit Firefox Add-ons website.

Popularity: 18% [?]

BitTorrent is a file distribution system used for transferring files across a network of people. As you download a file, BitTorrent places what you download on upload for other users; when multiple people are downloading the same file at the same time they upload pieces of the file to each other. BitTorrent pieces together the file you are downloading, to where the first part of a file you get may be the last part someone else gets. As you continue to retrieve the file, BitTorrent also uploads data to other users. For example, a person with 98 percent of the file done is directed to the people with the 2 percent of the file they still need.

The files downloaded via BitTorrent are called torrents.

Steps

• First you search for . torrent file through Torrent search Engines. Some famous ones are: www.thepiratebay.org, www.mininova.org, www.isohunt.com etc.
• Now you open the .torrent file with Torrent Client Software like : BitComet, uTorrent, Azureus etc. (Download and Install any one.)
• The Torrent client software will now talk to a tracker server to search for other users who have the same exact .torrent file as you. Each user will be automatically labeled as either a “leech/peer” or as a “seed” The more seeds you connect to, the faster your download will be.
• Now the client software then begins the transfer.

Popularity: 16% [?]

Phoogle Maps (pronounced like Foogle Maps) is a PHP class that integrates itself with the Google Maps API and with the Google Geocoding API to make an easy to use interface to display Google Maps on your site. With about 5 lines of PHP code you can display a customized Google Map on your website.

Go to http://code.google.com/apis/maps/ and register for api key with your gmail id and website, where the map will be displayed (the api works for the registered website’s only, any key works on localhost)

Get the a long alphanumeric Google Maps API key.

Use the zipped (phoogle_map.zip) google map example and edit as per requirement, must replace the key in all locations of files.

Recently the previous version has error saying “Fatal error: Cannot use string offset as an array in ….”
This error has also been fixed in the example.

Downlad the zipped file with Demo example.

Popularity: 18% [?]

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Popularity: 39% [?]