There are many alternatives to Intercepter-NG for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac alternative is Wireshark, which is both free and Open Source. If that doesn't suit you, our users have ranked nine alternatives to Intercepter-NG and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Intercepter-NG are Ettercap (Free, Open Source) and Debookee (Paid).
Wireshark is the world's foremost network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. It is the de facto (and often de jure) standard across many industries and educational institutions.
Almost everyone thinks Wireshark is a great alternative to Intercepter-NG.