Looking for free opt-in and auto-responders for your WordPress site to collect the name and email from your visitors, here are few suggestions:
1. BFT Autoresponder and Newsletter
http://wordpress.org/plugins/bft-autoresponder/
2. MailPoet Newsletters
http://wordpress.org/plugins/wysija-newsletters/
3. Newsletter Manager
http://wordpress.org/plugins/newsletter-manager/
4. Subscribe2
http://wordpress.org/plugins/subscribe2/
5. WP Email Capture
http://wordpress.org/plugins/wp-email-capture/
