Joomla Administrator Password Retrieve
This plugin will add link “Forgot password” at the bottom of administrator form. When user clicks on it, it will open a form asking email and fill captcha. After submission, it will reset password and send to email id.
Set your own string so that only you can see this “Forgot password” link. For example you set a string from administrator “xtr1sf”. You will only be able to see “Forgot password” link if you append this string to the administrator link. like:
Supports Joomla 3+ version
See Working demo here.