TOTPRadius is described as 'A simple and cost-effective way to provide secure, policy-compliant and user-friendly on-premises two-factor authentication solution with self-enrollment'. There are more than 25 alternatives to TOTPRadius for a variety of platforms, including Online / Web-based, Self-Hosted solutions, SaaS, Windows and Linux. The best alternative is Keycloak, which is both free and Open Source. Other great apps like TOTPRadius are Auth0 (Freemium), FreeIPA (Free, Open Source), LoginRadius (Paid) and FusionAuth (Paid).
Ory builds cloud-native authentication (login), authorization (permission), delegation (OAuth2, OpenID Connect), and user management software. You can deploy what you need yourself or use the Ory Cloud Platform and get started in minutes.
Amazon Cognito lets you add user sign-up/sign-in and access control to your web and mobile apps quickly and easily. Cognito scales to millions of users, and supports sign-in with social identity providers such as FB, Google, and Amazon, and SAML 2.0.
OpenID Connect / OAuth 2 server for single sign-on, identity provision and federation, and securing web APIs with access tokens. Supports profiles for fintech applications, eHealth, eGovernment and others.
An open-source, standards-compliant, and flexible OpenID Connect and OAuth 2.0 framework for ASP.NET Core. - Single sign-on for for applications - Supports applications developed for the web, mobile, desktops, devices, and more.