App Cloner - Clone your Android apps so you can use multiple logins.
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.
island - a free and opensource alternative to parellel space
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Dual Space - It is a first application that is compatible with WhatsApp completely.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.