Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Telegram X - Meet Telegram X for iOS and Android – two new official apps that offer more speed, longer batter life and smooth animations.
HTML PDF API - Easily generate PDF documents from HTML code with our powerful API
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.