Soul Mate Find is geared toward people who are trying to find life partners.While using the site is free, it does require "credits" which you earn by logging in every day or by referring friends to the site.
For example, you can play games, send virtual flowers and deliver e-cards to those you are interested in connecting with.
Oasis Active offers the option to search for romantic partners or platonic friends.
Casual Kiss is, as the name implies, for those who are looking for something casual.
You can browse anyone's profile without even logging in to the site, and most of them are brief in text and short on information.
You'll also get free relationship coaching via blogs and a popular message board.