WinDiff - Download Windiff : free files and folders comparison tool
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.
AptDiff - AptDiff is a visual text / binary files comparison and merging utility for Windows.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
CompareMerge - CompareMerge is a software tool for file comparison and merging text-like files. It is useful for determining what has changed between versions, and then merging changes between...
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents