Inno Setup Script Includes is a library of functions that can be implemented very easily into your existing setups build with Jordan Russell's Inno Setup.
InstallAware Studio Admin lets you reverse engineer existing Windows Installer setups and make customizations to them. Simply run the Database Import Wizard to produce a ready to build InstallAware setup project which can be further customized.
NETCheck is a utility that .NET developers can use within their own application to allow their software to run on any version of windows, even if the .NET framework is not available on the PC.
InstallSure is an easily configurable file installation program. There is no complex scripting language. Just drag and drop the files and set properties for each file.
ArInstall builds a professional installation program in a single compressed executable file. ArInstall offers full
support for un-installation, license agreements, ReadMe files, shortcuts creation, registry editing, DLL installation, and much more.
InstallAware Express is a remarkably easy installation authoring IDE that produces Windows Installer setups with support for setup themes, web deployment, IIS websites/virtual folders, ACLs, MS/My SQL and Oracle databases, and even Setup Capture!