wplift

Super Refer A Friend is plugin which adds a new widget to your blog which allows readers to email the page they are on to a friend via a popup box. 
They can enter more than one email address and customise the message that is sent. 
The plugin includes a captcha and you can set a mailing limit to prevent spam
Support at http://wplift.com/refer-a-friend-wordpress-plugin

Super Refer A Friend

Creates a widget to send the current page to a friend via email with a message.

Refiral

Refiral helps you boost your sales up to 3X.
Launch your referral campaign virally. Run your personalized, easy to integrate, fully automated referral programs FREE of cost!
Check out how it works, watch out our video at www.Refiral.com or write to us at support@refiral.com
Refiral helps you targets all three pain points for any e-commerce website: 
1. Increase conversion rate: Convert visitors to customers by offering instant discounts 
2. Acquire new customers: Capture your customers’ friends. Promote among the ones who really buy. 
3. Retain existing customers: Make existing customer happier. Reward them for spreading love for your brand.
You start for FREE, you pay us only after you earn! 
NO setup/installation fee. NO minimum usage fee. NO long-term contract.

Launch your referral campaign virally. Boost your sales upto 3X with our new hybrid marketing channel. Run your personalized, easy to integrate fully  …

Super Refer A Friend vs Refiral