TLDR: Mos Authenticator (calls home)

Shit
LinOTP
GAuth
TwoStepsAuthenticator
gauth4win (obsolete)

Bad
FreeOTP
Phones only
JAuth (Java, old)
FXAuth ("JavaFX")
"Authenticator" (by: "jcuff") (useless, some type of front-end for Google Authenticator)

OK
Mos Authenticator (calls home)

Appears BEST, but not really
Windows Authenticator AKA winauth (FOSS, portable)

Windows Authenticator AKA WinAuth

There is also a .Net 3.5 build of WinAuth that can be run on Windows 7 installations "out of the box".

Requires Microsoft .Net 4.5

If you choose to use the newer .NET Framework, thus introducing incompatibility to millions of Windows7 users, you are an idiot.

Also stupid readme.md

And looking at the changelog, scary sounding security bugs are still being fixed.

Insecure!

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