• Generates self contained executable installers
• Support for ZLIB, BZIP2 and LZMA data compression (files can be compressed individually or together)
• Uninstall support (installer can generate an uninstaller)
• Customizable user interface (dialogs, fonts, backgrounds, icons, text, checkmarks, images etc.)
• Classic and Modern wizard interface
• Fully multilingual, support for multiple languages in one installer. More than 60 translations are available, but you can also create your own. Unicode support allowing even more languages.
• Page system: You can add standard wizard pages or custom pages
• User selection of installation components, tree for component selection
• Multiple install configurations (usually Minimal, Typical, Full), and custom configuration
• Installer self-verification using a CRC32 checksum
• Small overhead over compressed data size (34 KB with default options)
• Ability to display a license agreement in text or RTF format
• Easy to use plug-in system (lots of plug-ins for creation of custom dialogs, internet connections, HTTP downloading, file patching, Win32 API calls etc. are included)
• Installers can be as large as 2GB
• Optional mode for automated installations
• A preprocessor with support for defined symbols, macro's, conditional compilation, standard predefines
• A lovely coding experience with elements of PHP and assembly (includes user variables, a stack, real flow control, etc.)
• Installers have their own VMs that let you write code that can support:

• File extraction (with configurable overwrite parameters)
• File/directory copying, renaming, deletion, searching
• Plug-in DLL calling
• DLL/ActiveX control registration/deregistration
• Executable execution (shell execute and wait options)
• Shortcut creation
• INI file reading/writing
• Generic text file reading/writing
• Powerful string and integer manipulation
• Window finding based on class name or title
• User interface manipulation (font/text setting)
• Window message sending
• User interaction with message boxes or custom pages
• Branching, comparisons, etc.
• Error checking
• Reboot support, including delete or rename on reboot
• Installer behaviour commands (such as show/hide/wait/etc)
• User functions in script

• Completely free for any use. See license.