Simply by enabling the plugin can set up a basic auth to dashboard and login page.
Chaging wp-admin to anything you want.
This Plugin allow you to change wp-dmin login logo from admin panel. You can simply add logo from your computer or media library.
Lockdown WP Admin conceals the administration and login screen from intruders. It can hide WordPress Admin (/wp-admin/) and and login (/wp-login.php)
Save your WordPress sites and servers from certain death during brute force attacks with Project Force Field by Orion Group!
Customize WordPress admin, set your own logo, customize login form, hide admin bar, restrict access to wp-admin for subscribers.
Add CSS code in the Back-end and Front-end easily
This plugin blocks distributed botnet brute-force attacks on your WordPress installation.
This plugin allows you to skin WordPress Admin's visual interface by selecting your own colors.
Small and simple security plugin that allows you to change url of wp-admin
Show messages in WP Admin. Different messages can be shown at different places, for different people.
Plugin project for refreshing WordPress core's widget interface. http://make.wordpress.org/ui/tag/widgets/
A powerfull widget for displaying categories with image.
Turn your Oldschool textarea code editor in WordPress Dashboard (plugin/theme editor) into a fancy realtime highlighted code editor using Editarea.
Manage one widget area at a time to maintain widget sanity.
Simple, but strong HTTP security, to prevent Brute force attack. One-click solution!
Hide the referrer for external links in wp-admin using href.li
With this plugin you can login to wp-admin using your GMail credentials
Block access to the admin interface based on user capability. The default is only editors and admins are allowed access, but the required capability c
Aspexi Easy Login URL changes your url/wp-login.php URL into your custom string i.e. url/login and more (incl. Register and Forgot password links).
Block Admin allows you to restrict access to the defualt WordPress admin panel.
This plugin is real simple and basic, it doesn't allow anyone that does not have admin rights to access wp-admin. This will help ensure security.
Filter pages in the wp-admin by their parent pages
With this plugin you can warn other wp-admin users. For example, you can type “Don’t touch widgets! I’ll fix it tomorrow !”
Gives a shorter url to media links in your media library.
Adds buttons to the visual editor, which give you more functionality when editing posts.
Customize your login form page and redirect to homepage
DW Admin Block, blocks access to the admin interface based on their user capabilities.
AVOID TO USE THIS PLUGIN! Change wp-admin and wp-login URL to any of your choice. Security by obscurity!