New: Get Free Two-factor Authentication that you control for up the 5 users.
The WiKID Strong Authentication System is a patented dual-source, self-hosted, software-based two-factor authentication system designed to be less expensive and more extensible than hardware tokens.
Please download our server: http://www.wikidsystems.com/downloads/how-to-test-and-get-wikid. Why use a service when you can control the keys to your kingdom?
For older phones (pre-Android 4.4.2, please see https://play.google.com/store/apps/details?id=com.wikidsystems.android.