ChameleON Social - Create your own dating site or social network
SocialEngine - Socialengine PHP: Elevating Your Online Community Experience.
vldPersonals - Full-featured PHP solution for running an online dating site.
phpFox - phpFox is a powerful social network platform for niche communities
ProDatingScript - Start your own dating kingdom using ProDatingScript which includes Windows Software,Android App! Buy now to get the key to the kingdom
BuddyPress - WordPress social networking in a box.