icmptx is described as 'ICMPTX is a program that allows a user with root privledges to create a virtual network link between two computers, encapsulating data inside of ICMP packets' and is an app in the network & admin category. There are three alternatives to icmptx for a variety of platforms, including Mac, Windows, Linux, Android and Android Tablet apps. The best icmptx alternative is Iodine, which is both free and Open Source. Other great apps like icmptx are DNScapy and SlowDNS.
iodine is a free (ISC licensed) tunnel application to forward IPv4 traffic through DNS servers (IP over DNS). Works on Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X and Windows.
DNScapy is a DNS tunneling tool. The code is very light and written in Python. It includes a server and a client. The server can handle multiple clients.
