Forms
Free Plugins available at WordPress.org
Contact Form 7
Contact form plugin. Simple but flexible, and very popular.
Slick Contact Forms
Slick contact forms allows you quickly and easily create contact forms for any area on your WordPress site using widgets. Creates a widget, which adds a contact form using either a floating, drop down button or a sticky, sliding tab. Can handle multiple forms on each page and the location of the floating button or sliding tab can be easily set from the widget control panel. Each form includes up to 3 text input fields and one text area. The input labels and type of validation can be set via the widget control panel. The plugin includes validation for the form fields using animated error messages. The plugin also includes shortcodes, which allow you to add a text link to your content, which will open/close the contact form.
Fast Secure Contact Forms
A super customizable contact form that lets your visitors send you email. Blocks all automated spammers. No templates to mess with.