Express Rip - Express Rip CD ripper can convert CD audio to mp3 or wav file formats.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
XRECODE - XRECODE can convert multiple audio files in parallel by taking full advantage of multi-core CPU.
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
winLAME - winLAME is an encoder for several audio formats, including mp3 (MPEG Layer 3), Ogg Vorbis and more.
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.