Pre-Registration Email Validation plugin allows your users to validate their email id before registration.
With Login Failure Alert plugin you can receive email alerts when login attempt made by user is not successful.
Reset Hits plugin is small plugin which reset the hits counter of article, if you want.
Login notify is a plugin that send email alert when any user log-in to the system.
This plugin allows you to create logout button anywhere in Joomla! website.
Delete My Account can give an option to your site members, through which they can delete their account.
Template Assigner is a Joomla! plugin, which can be used to assign template style according to Joomla! User Group.
Usergroup Selector allows you to chose those usergroup(s) which should be allowed to select by user, at the time of registration.
It is a Joomla! plugin which filter the content of an article according to users' Joomla! usergroup.
Registration validation plugin add the ajax validation support to default Joomla! registration.