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Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
Tweek.so - A concise and simple weekly to do list calendar app to organize your tasks online. A lightweight weekly planner to maintain your focus and boost productivity week over week.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
HTML PDF API - Easily generate PDF documents from HTML code with our powerful API