Pdfremote

Pdfremote is a service for the synchronized demonstration of a presentation on any device. Upload your presentation as a PDF document to pdfremote.com with any device, share it via a QR code, and view it in sync with other participants. With Pdfremote, you don’t need a clicker; control the presentation on a projector with your smartphone. Once the demonstration is finished, the link becomes unavailable which protects your presentation from further distribution or downloading. The service is free of charge and does not require registration.

Advantages - Free of charge, no registration required - Safe; no need to download the presentation on the local device.