Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.
ChameleON Social - Create your own dating site or social network
Tinder - Tinder is how people meet. It's like real life, but better.
vldPersonals - Full-featured PHP solution for running an online dating site.
Hinge - Find people you want to date through your friends on Facebook.
Skadate - Skadate is a dating software.