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Inno Setup is a free installer for Windows programs. First introduced in 1997, Inno Setup today rivals and even surpasses many commercial installers in feature set and stability.

Key features:

* Support for all versions of Windows in use today: Vista, XP, 2008, 2003, 2000, Me, 98, 95, and NT 4.0. (No service packs are required.)

* Extensive support for installation of 64-bit applications on the 64-bit editions of Windows. Both the x64 and Itanium architectures are supported.

(On the Itanium architecture, Service Pack 1 or later is required on Windows Server 2003 to install in 64-bit mode.)
* Supports creation of a single EXE to install your program for easy online distribution. Disk spanning is also supported.

* Standard Windows 2000/XP-style wizard interface.

* Customizable setup types, e.g. Full, Minimal, Custom.

* Complete uninstall capabilities.

* Creation of shortcuts anywhere, including in the Start Menu and on the desktop.

* Creation of registry and .INI entries.

* Integrated Pascal scripting engine.

* Support for multilingual installs.

* Support for passworded and encrypted installs.

* Silent install and uninstall.

* Full source code is available (Borland Delphi 2.0-5.0).