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.
DSTRUX - Self-Destructing Files on iOS
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Shredo - Secure, permanent deletion of files and folders for your Mac
Cotap - Cotap is a simple, secure mobile messaging app for fast, easy workplace communication.
FCorp My Calendar - Manage diary/note, schedule, todo, birthday, etc.