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Nullsoft Scriptable Install System is an open-source tool based on script files, which is used in developing stable simple or advanced Windows installers.
As a professional tool it is able to create even web installers since several plug-ins and scripts are available.

NSIS is described as being small, fast and efficient, with an installer’s overhead of only 34KB, unlike hundreds of kilobytes or several megabytes that other installers add.

The installer created is compatible with Windows 95/98/ME/NT/2000/XP, Windows Server 2003 and Vista and supports multiple interface languages as well as right-to-left languages.
Compression methods available are: ZLib, LZMA and BZip2.
The program allows developing of a custom interface using the classic and modern wizard interface that NSIS includes.
The plug-ins brought by NSIS can be written in languages including C, C++ and Delphi and can communicate with the installer.
A set of plug-ins allows downloading of files from the Internet and even patching existing files.
The generated installer will run on Windows only but the NSIS compiler can be compiled for Linux and BSD.

NSIS 2.30 beta version comes with a modern UI 2 which makes use of nsDialogs and supports better the external strings.
Among other changes, the version 2.29’s bug has been fixed so that invalid $SMPROGRAMS value on Windows 98 won’t be caused anymore.

The NSIS 2.30 tool can be downloaded free of charge from here.