privacyIDEA is described as 'Modular authentication server that can be used to enhance the security of your existing applications like local login, VPN, remote access, SSH connections, access to web sites or web portals with two factor authentication' and is an app in the security & privacy category. There are three alternatives to privacyIDEA for a variety of platforms, including Mac, Windows, Linux, Android and iPhone apps. The best privacyIDEA alternative is WiKID Strong Authentication. It's not free, so if you're looking for a free alternative, you could try stoken.
The WiKID Strong Authentication System is a highly scalable, secure, self-hosted two-factor authentication system. It is simple to implement and maintain, allows users to be validated automatically, requires no hardware tokens, has a simple API for application support (via Ruby...
RSA SecurID Software Tokens: Make strong authentication a convenient part of doing business. Deploy RSA software tokens on mobile devices—smartphones, tablets, and PCs— and transform them into intelligent security tokens.
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