Orca is described as 'exe is a database table editor for creating and editing Windows Installer packages (.msi) and merge modules. The tool provides a graphical interface for validation, highlighting the particular entries where validation errors or warnings occur'. There are seven alternatives to Orca for Windows. The best alternative is Advanced Installer, which is free. Other great apps like Orca are Master Packager (Freemium), InstEd (Free), SuperOrca (Free) and InstallAware (Paid).
Advanced Installer is a powerful and easy to use setup authoring tool which offers full Windows Installer support and more. You can configure every aspect of your installer through a simple graphical user interface or through its command line.
InstallAware provides Windows Installer (MSI) authoring, MSI compression, and MSI repackaging solutions. Tools include: InstallAware for Windows Installer, Setup Squeezer for Windows Installer, and Setup Squeezer for InstallShield.