PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.
Yout - YouTube to Mp3 Converter
PDFSwitch - Convert any HTML document or URL to PDF with a single API request.
Softorino YouTube Converter - Download YouTube video & audio. Watch and listen offline
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
You-Get - Command-line utility to download media contents from the web