Cybersuitors  
   Matches test-takers with partners who are right for them based on a compatibility test developed by Dr. Glenn Wilson.
   http://www.cybersuitors.com/

EmodeMatch  
   Personality test developed by Emode to match test-takers with others who have compatible personalities.
   http://www.emode.com/match/create/profile2.jsp

Finding the Love of Your Life  
   Offers a personality profile as a tool to reveal compatibility, emotional development level and natural preferences for specific personality type. Identifies positive and negative traits. Reveals mismatch and complement levels.
   http://findingtheloveofyourlife.com/

Socionics Dating  
   Uses the Socionics personality typing system to identify others who are compatible.
   http://socionicsdating.com/

Type Tango  
   A dating site using Myers-Briggs/Keirsey personality theory for matching.
   http://www.typetango.com/

Enneagram Love Match  
   Online quiz to determine you and your partner's Enneagram type and to explore the compatibility issues between you.
   http://www.swoon.com/horoscopes/enneagram/

SimilarMinds.com Compatibility Test  
   Rates friendship and relationship compatibility between two people.
   http://similarminds.com/match/

eHarmony  
   Personality matching of couples on 29 dimensions that determine long-term success.
   http://www.eharmony.com/

Your Zona  
   Offers a personality test focused on relationships.
   http://yourzona.com

Jung Marriage Test  
   Marriage compatibility test based on the famous approach of Jung and Myers-Briggs. Gives a quantitative measure of partners compatibility.
   http://www.humanmetrics.com/infomate/infomatepass.asp

SimilarMinds.com Search  
   Take a 45 question personality test and determine compatibility with friends or find others that score similar to you.
   http://similarminds.com/search