Open Peeps - A hand-drawn illustration library.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Control Illustrations - 108 free flat illustrations with customizable characters
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Craftwork - A collection of User Interface resources made by Craftwork
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.