AndOTA is a C# WinForms implementation of the sdat2img script. It allows you to convert Android Lollipop (5.0) and newer OTA files (system.new.dat, system.transfer.list) to ext4 images.
As mentioned above the utility is written in C#. The current target framework is .NET Framework 4.5.
This is basically just a reimplementation of the already existing sdat2img Python script. The sdat2img repository can be found here: https://github.com/xpirt/sdat2img
The project uses a C# implementation of the Python range function. It was originally created by David Tchepak and published on his blog at https://davesquared.net/2008/01/python-like-range-implementation-in-c.html