multiOTP is an open source PHP class, a command line tool, and a web interface that can be used to provide an operating-system-independent, strong authentication system. multiOTP is OATH-certified since version 4.1.0 and is developed under the LGPL license. Starting with version 4.3.2.5, multiOTP open source is also available as a virtual appliance - as a standard OVA file, a customized OVA file with open-vm-tools, and also as a Hyper-V downloadable file. A QR code is generated automatically when printing the user-configuration page.