EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

EveryoneSocial - Social selling and employee advocacy software designed to help employees become powerful marketers, sellers, and recruiters.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Swagbucks - Swagbucks is a loyalty program that offers individuals rewards for engaging in various activities. Users can earn reward points for performing Internet searches, purchasing items from affiliated vendors, or completing polls.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

SocialRank - Graph search for TWTR. Filter by interests, location, etc