
Problems with Our Download Server
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Here is what we suggest now: We haven't updated the Zfone web site in a long time because Zfone has been largely superceded by Silent Phone, from Silent Circle, co-founded by Phil Zimmermann. Silent Phone is a better, more advanced product than Zfone.
If you are a software developer in need of a good ZRTP SDK, we can recommend two subroutine libraries from Werner Dittmann. ZRTPCPP for C++, and ZRTP4J for Java.