Allow your users (except for administrators) to manually delete their own accounts.
A plugin to replace the default user flow, for login, logout, account(profile)
The ability to mark specific users as spammers like on Multisite install.
A professional, high-performance e-commerce development plugin for WordPress.
With this plugin you can time limite the users accounts registered on your website for a specific amount of time.
Add a new section under Settings for your social accounts. The order and the images can be customized with ease.
Sync SugarCRM Users to WordPress and vice versa
If logged in, the visitor can view all the pages/posts on the blog. If not logged in, the visitor can only view a specific public page.
Limits the number of simultaneous sessions a user can host, via IP.
This plugin locks user account after given number of incorrect login attempts. This makes brute force and dictionary attacks nearly impossible.
Twitter Counter Cache-rizer show the number of followers a certain Twitter account has, even when Twitter is offline.
Google Friendsconnect OpenID & Faces widget.
Audit WordPress user passwords against a dictionary file.