Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
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.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.