Using this extension for Visual Studio 2012-2005 developers can convert existing VDProj setups to WiX in one click. All Visual Studio versions and all vdproj features are supported, including variables, msm and msi packages, custom actions, built-in dialogs, etc.
CreateInstall Free is a freeware installer for producing good looking setups. Building installation projects are surprisingly easy with its simple user interface. The resulting setup files can be compact and easy for the end user to install.
Downloads: 73422 - Freeware - Download Now
This extension program for Inno Setup allows you to add repair, modify and remove support to your applications with minimal effort. It is very small because use Assemble.
Downloads: 84841 - Freeware - Download Now
MSIDIFF is freeware to compare or disassemble Windows Installer databases (a "MSI to TEXT" utility). While it is a command line based tool, the installer creates shell extensions so that it can be invoked by right clicking on a file in Explorer.
Downloads: 104319 - Freeware - Download Now