S2 member

s2Member is an extremely powerful ( and free ) membership management system for WordPress®. The s2Member Framework ( free ) integrates seamlessly with PayPal® ( very easy ), and fully supports recurring billing, with the ability to track affiliate commissions on a recurring basis. s2Member supports custom Pages for registration ( including Custom Registration Fields ), account access, and a whole lot more. Now compatible with Multisite Networking too, and even with BuddyPress if you like!

SlideNote

SlideNote is a customizable, flexible jQuery plugin that makes it easy to display sliding notifications on your website or in your web application.

Antispam Bee

Antispam Bee protects your blog from user and trackback spam. Without registration. Anonymous. With numerous settings. It’s easy to use and extremely effective. Really!

Thank Me Later

Sends thank you emails to blog commenters.

Updraft

The best backup plugin I’ve found for WP sites. Scheduling and remote storage options included.

GD Star Rating

GD Star Rating is advanced and feature packed plugin for setting up rating system on your WordPress blog. Plugin allows you to set up different rating systems for posts, pages and comments with great degree of customization.

List of features is very, very long, and you can check it out on the page on the right, or better yet go to the official website. Plugin will still remain free and there is no intention for that to change. But, support terms are changed and here you can find more info on that.

Hikari Hooks Troubleshooter

Hikari Hooks Troubleshooter creates a draggable window with informations about WordPress hooks. It lists all hooks (actions and filters) that have at least a function hooked to them, and for each hook there’s a list of hooked functions, sorted by their priority!

Reveal IDs

With WordPress 2.5 being released, the IDs on all admin pages have been removed as it is. Propably due to the fact that the common user dont need them. However, for advanced WordPress Users/ developers those IDs were quite interesting for some plugins or template tags.

What this plugin does is to reveal most removed entry IDs on admin pages, showing the entry IDs, as it was in versions prior to 2.5.

Magic Members

Magic Members is a premium WordPress Membership Plugin that turn your WordPress blog into a powerful, fully automated membership site.

  • Unlimited Membership Levels
  • Easy Integration with Existing or New WordPress Blogs
  • Flexible Membership Options
  • Payment Integration Modules
  • Control Subscription Length
  • Unlimited Coupon Creation
  • Login Redirection
  • Sequential Course Delivery System
  • Controlled Content Access
  • And much more!

New2WP Witter Twidget

Sometimes you just need a basic widget that isn’t all packed with crazy options and included files. This plugin comes packaged as basic as you can get with no bells and whistles or anything useless. Just the bare essentials for doing what you need to do.

Now you can display your latest Twitter updates in your sidebar, and not have a ton of overhead or extra stuff slowing your site down.