Website Downloader - Download source code from any website
pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.
CONV. - Convert YouTube video to MP3, GIF or MP4
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Image Cyborg - Download all images on a web page
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents