Shiptheory - Integrate your CRM or Web Store with your carrier for automatic shipping label generation.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
Channergy Omni Channel Manager - Order, Inventory and Channel Manager
DocRaptor - As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more
Fulfil.IO - Cross Channel (offline, online, social & mobile)ERP for retailers.
PDFCrowd - Pdfcrowd is a Web/HTML to PDF online service. Convert HTML to PDF online in the browser or in your PHP, Python, Ruby, .NET, Java apps via the REST API.