1)   007 Link Exchange Easy 2.21
Link Exchange Easy: Find, suggest, add and exchange cool reciprocal links to improve your web site link popularity and google page rank. Find cool links by keywords and backlinks by site. Find backlinks to all the top ranking sites by keywords.

 2)   External Link Promotion 2005.1
External Link Promotion: Easy powerful web link popularity & google pagerank boost tool. Easy to find thousands of prospective link partners with top google page rank, Easy to send link exchange request emails. Fill add-link form intelligently.

 3)   LinkAssistant 2.1.1
Increase Your Link Popularity with LinkAssistant - the Most Intelligent SEO Tool for Reciprocal Link Exchange

 4)   QuidProQuo 1.04
Multithreaded QuidProQuo quickly scans through your site to locate your link partners and spiders through your link partners sites to verify reciprocal links back to you.