Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
HackerThemes - Bootstrap 4 themes and tools for web developers
Telegram X - Meet Telegram X for iOS and Android – two new official apps that offer more speed, longer batter life and smooth animations.
Bootstrap 4 Cheat Sheet - An interactive Bootstrap 4 cheat sheet
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.