To develop mobile applications with Zebble you don't have to have Android or iOS tools for the most part. You can go 99% of the way on your Windows development machine alone.
To create a new project, run the following command:
More information here.
To build a Universal Windows Platform app with Zebble, you will need:
This is optional. To build an Android app with Zebble, you will need Xamarin for Visual Studio, Android SDKs, Emulators, etc (see the link) below.
This is optional. You need a Mac in order to compile test and deploy iOS applications. If you don't have a Mac, you can get a cloud Mac build machine.
On your Mac
On your Windows