Document Cyborg - Easily save a web page as a document (PDF, WORD, EPUB, ODT, RTF or Text)
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents
PDFium - The C# PDF Library to Create and Edit PDF documents in .
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
DynamicDocs API - Dynamic PDF Generation via API and Excel
HTML PDF API - Easily generate PDF documents from HTML code with our powerful API