Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
My Data Manager - Description Take control of your mobile data and save money on your mobile phone bill!
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Data Usage - Data Usage Monitor | Your guard against data plan overages.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
DataMan – Data Usage Widget - DataMan – Data Usage Widget is an application that enables its user to know how much data he has spent from the total internet package he is using.