FriendFeed API Core
Plugin loads the core FriendFeed API PHP wrapper library so that all other Plugins that utilize this library can share the same up-to-date version. It also helps minimize potential conflicts between FriendFeed powered Plugins.
Twitter Tools
Twitter Tools is a plugin that creates a complete integration between your WordPress blog and your Twitter account.
Buy Sell Ads
Easily integrate your Buy Sell Ads zones and includes anti-AdBlock meaures to prevent AdBlock (and similar software) from blocking the advertisement.
AdRotator
Ad Rotating solution for your ads (including AdSense, Clicksor, Chitika etc.)
Feed Footer WordPress Plugin
Allows you to add footers under all your blog posts in your RSS feed. With this nifty plugin, you can add copyright notices under all your Blog Posts in the RSS feed or monetize your RSS Feeds for more earning.
More Fields
Adds boxes to the Write/Edit page. These boxes contains input fields, so that additional (more) fields can be added to a post.
Contact Form 7
Contact Form 7 can manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on.
scbFramework
This is a base plugin required by other plugins. It consists of several classes that help plugin developers write plugins easier.
WP-Cumulus
WP-Cumulus allows you to display your site’s tags, categories or both using a Flash movie that rotates them in 3D. It works just like a regular tags cloud, but is more visually exciting.
WP-Bar
Creates a navigation bar for all external links outside of blog. WP-Bar also has social network links such as Facebook, Digg, Delicious, StumbleUpon and Twitter to allow your users to share your featured links. This is a similar feature to the DiggBar on Digg.com.
Twitter Search
Allows users to keep track of twitter search terms from within their wordpress dashboard. Find people tweeting about topics related to your blog and engage them.
TNX-WP
automatically places money-making links from TNX onto your WordPress blog. It allows you to automatically place links before and after content, comments, in the sidebar and in the footer; or a mixture of all these.
Project Manager
This plugin is a datamanager for any recurrent datasets. It can be used to manage and list a DVD collection, to to present portraits (e.g. athlets of a team), simple tabular calendar or anything you can think of.
Q-Sensei Search Widget
This Plugin allows to start a search at Q-Sensei.com directly from your WordPress Blog.