This Plugin creates a form to collect the name and email from your visitors, who are then redirected to the web address of your choice.
CP Easy Form Builder is a contact form plugin that allows creating contact forms and email them.
Bmail is a mass email client that allows you to send emails through your site.
WP Easy Leads is a lead generating plugin that lets you create your own lead page to capture lead.
Comment-Emailer allows you to customize the email wordpress automatically sends when a new comment, pingback or trackback has been approved.