NSIS (Nullsoft Scriptable Install System) is a professional open-source tool for the development of Windows installers. It is designed to be as small and flexible as possible and is therefore highly suitable for internet distribution.
NSIS 3.0a2 is released. Lots of love has been put into this special holiday release, so we hope you enjoy all the bug fixes, new features and POSIX support improvements.
Download:
http://nsis.sourceforge.net/Download
Release notes:
http://nsis.sourceforge.net/rn/v3.0a2