Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
Yout - YouTube to Mp3 Converter
Anvil PDF Filling API - The easiest way to programmatically populate any PDF
You-Get - Command-line utility to download media contents from the web
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request