RSA Authenticator (SecurID) is described as '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' and is an app in the security & privacy category. There are four alternatives to RSA Authenticator (SecurID) for a variety of platforms, including Linux, Mac, Windows, Android and iPhone apps. The best RSA Authenticator (SecurID) alternative is OnlyKey. It's not free, so if you're looking for a free alternative, you could try privacyIDEA or stoken.