RoxyApps Spreadsheet Conversion Tool - Converts csv, et, numbers, xls, xlsx, ods and other spreadsheet files to png, pdf, html, jpg, and other formats
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.
XLS to XML - XLS to XML is the name of a portable and cross-platform application for converting the XML file to the XLS and vice versa.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
XML Converter Standard Edition - XML Converter Standard Edition is a way to transform the data stored in the XML format to XLS format within few minutes.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents