contrive

This plugin allow you to add filter and sorting column on the post list page and page list page in dashboard. You just need to go to setting you will find two submenus Filters and other one is sorter. You will find the customfields there selected customfields will be used and filter and sorter in respective posttype page.

Filter & Sorter

This plugin allow you to add filter and sorting column on the post list page and page list page in dashboard.

Silkalns

WP Chill

Cristian Raiber

A very useful plugin for everyone using WordPress. Adds reCaptcha security to the WordPress login form, register form and comment form. This plugin could help your blog get rid of a lot of spam comments or brute-force attacks.
Nothing gets passed it if the reCaptcha doesn’t validate.
A few notes about the plugin:
<ul>
<li>Supports audio or image captcha types</li>
<li>Can generate the reCaptcha image / audio type in a number of predefined languages</li>
<li>Adds reCaptcha protection to the WordPress login form</li>
<li>Adds reCaptcha protection to the WordPress register form</li>
<li>Adds reCaptcha protection to the WordPress comment form</li>
<li>Adds reCaptcha protection to the WordPress recover password form</li>
</ul>

Uber reCaptcha

This plugin adds the reCaptcha form to the WordPress login form, recover password form, register form and comment form.

Filter & Sorter vs Uber reCaptcha