Phplite Recommend  

Phplite Recommend 1.1 provides your user the ability to recommend your website to their friends. It is an excellent way of allowing your users to do the promotion for you and spread the word about your great website.

Hosting Requirements: PHP 4.1.0+
Price: Free

   Chipmunk Recommend  

Allows visitors to recommend your site to others.

Hosting Requirements: Linux, FreeBSD
Price: Free

   Recommend !t  

This is a very flexible scripts that can be used on any page you want and do exactly what we expect: Recommend the Page'S Url. The number of emails to recommend is up to you. It can be unlimited.

Price: Free

   SMe_Tell  

SMe_Tell is a site recommendation script that sends thank-you messages to those who recommended your site. Features: messages in html - online administration - WYSIWYG editor - Stats and more.

Hosting Requirements: PHP 4.2+
Price: Free

   SiteRefer  

Enable your site visitors to recommend their friends and colleagues to your site with SiteRefer. This fully-featured script is easy to install, and is configurable through a web interface.

Hosting Requirements: Unix/Linux
Price: Free

   RGNRecommend It!  

RGNRecommend It! is a handy script that allows web site owners add more interaction with their readers. Readers can click either an image or text link to have a pop up window allow them to recommend that current web page to someone elses email address for viewing. With its powerful log viewer you can see which pages are recommended the most.

Price: Free