PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
EarTrumpet - Volume Control for Windows
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.
Sound Control - App-specific volume control
PDFSwitch - Convert any HTML document or URL to PDF with a single API request.
Power mixer - Power Mixer is a complete Windows volume control replacement.