Agna is a freeware application designed for social network analysis, sociometry and sequential analysis. Platform-independent, friendly and easy-to-learn, integrated visual network editor, html output, free.
Anti-Social is a productivity application for Macs that turns off the social parts of the internet. When Anti-Social is running, you’re locked away from hundreds of distracting social media sites, including Facebook, Twitter and other sites you specify.
BuddyPress is a suite of WordPress plugins and themes which extends WordPress MU and brings social networking features to a new or existing installation.