It uses a unique compatibility matching algorithm that can help you find the right person for you.
Zoosk - Zoosk is a free dating site that is very popular in countries around Asia. It hosts millions of users from all around the world, and it has a large membership base in North America.
PlentyOfFish - PlentyOfFish is another very popular free online dating site. It has a large user base and is used by singles of all ages, ethnicities, and sexual orientations.
OKCupid - OKCupid is one of the most well-known and popular free online dating sites. 
This is a list of some of the most well-known sites that do not require a fee for a membership:
There are a number of free dating sites that are popular around the world.