John Mann

This popup form allows user to add a popup form easily on their blog for high visibility. 
That popup form will send emails to site admin, or configured address.

LotekMedia Popup Form

Plugin to allow users to create and add a popup form easily on the website.

shawfactor

This plugin provides a shortcode to include a HTML5 login form on a page on your website and will natively link to this form throughout your site. You can configure the plugin to select whether you prefer to use email addresses or user names for your users to login.
On activation a page with the shortcode [lh_login_page_form] will be created o0n your site, and it will become your front end login page.
To change the login url to a page where you have the front end form navigate to Wp Admin->Settings->LH Login Page and paste the page id into the field.
Check out <a href="http://lhero.org/plugins/lh-login-page/" rel="nofollow ugc">our documentation</a> for more information.
All tickets for the project are being tracked on <a href="https://github.com/shawfactor/lh-login-page" rel="nofollow ugc">GitHub</a>.
Features:
<ul>
<li>Front end login form inserted via shortcode</li>
<li>Option to login using an email address rather than username</li>
<li>Multiple instances possible: Place login form shortcode multiple pages or in sidebars and widgets</li>
<li>Ability to specify a custom url to which users will be redirected on logon</li>
<li>If configured will override the WordPress login url so that login links point to to your front end login page (extra security)</li>
</ul>

LH Login Page

Easily place a HTML5 login form on the front end of your website

LotekMedia Popup Form vs LH Login Page