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Omnistar Tell is a dynamic web site promotion software tool that enables you to use a "Tell a Friend" link for website visitors to share your site with their friends. Omnistar Tell’s referral script is extremely easy to use and includes a simple administrative area that lets you edit the look of the "Tell a Friend" popup window and the e-mail messages the recipients will see.
Price: $19.95

Some of the best way to generate traffic to your website, or promote your services is via word of mouth. By providing Recommend It to your visitors, you offer them the ability the recommend your site to their friends! It is a low-cost, and very effective tool.
Price: $5.95

A simple php script for sending a link of any webpage to visitors friends. Supports multiple emails.
Price: Freeware

Set how many people they can tell Custom description in sent out email, Custom sent email page.
Price: Freeware