The bundle includes:
- GameMaker: Studio Pro
- HTML5 Module
- Android Module
- iOS Module
- Windows UWP Module
At the $15 level plus some games + source code. Over at reddit they have it as approximately $1,800 worth of software.
Of course the chatter is that 2.0 is around the corner, but for $15 this seems too good to pass up.
Plus they have Tropico 4 for free..