TinyMCE Advanced Plugin (DOWNLOAD HERE)
Provides a better writing tool while creating post or pages in wordpress. e.g. setting font sizes, background colour, font family etc.
Nice Login Widget Plugin (DOWNLOAD HERE)
Provides a better login view that can be added from the widget section.
Admin Bar Minimizer Plugin (DOWNLOAD HERE)
This plugin allows you to manually make the admin bar appear or disappear with a click. You can choose to make the bar show or not show by default, and there are also controls for both the front end and the back end admin bar.
User Role Editor Plugin (DOWNLOAD HERE)
User Role Editor WordPress plugin makes user roles and capabilities changing easy. Edit/add/delete WordPress user roles and capabilities.
Adminimize Plugin (DOWNLOAD HERE)
Adminimize that lets you hide 'unnecessary' items from the WordPress backend.