[Freeware] This authoring tool can create Windows Installer Packages. 
[From the Author]

Features
AInstaller is a small tool designed to easy create simple installations, where all files will be installed into the single program folder. Main characteristics:

• creates single file Microsoft Windows Installer packages with embedded cab file
• small size of the installation logic – from 50 kB
• can merge into the installation package other vendor merge packages
• limited folder path analysis in registry, INI file and ODBC data source values 

Limitations

• only one feature, additional features can be added only using merge packages
• this tool allows to edit only packages created by it
• in some cases other msi package edition tools like Microsoft Orca may be needed to manually correct installation package

Visit the AInstaller Site