123apps - A free web app that converts video files, allowing you to change the video format, resolution or...
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.
online2pdf - This Online PDF Converter can convert all your files to PDF but also compress and merge PDF files! Word, Excel, PowerPoint, images and any other kind of document can be easily converted to PDF on Online2PDF.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Zamzar - Free conversion online of many type of documents (images, text, video, audio...
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents