What are some alternatives?
When comparing IzPack and Get Mac Apps, you can also consider the following products
Inno Setup - Inno Setup is a free installer for Windows programs.
Ninite - Ninite is the easiest way to install software.
NSIS - NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows...
Ketarin - Ketarin is a small application which automatically updates and optionally installs setup packages...
WiX - Create a free website with Wix.com. Customize with Wix' website builder, no coding skills needed. Choose a design, begin customizing and be online today
Zero Install - Zero Install is a decentralised cross-distribution software installation system.