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 3.0rc1 is the first release candidate for NSIS 3. It contains additional DLL hijacking prevention code, a fix for !appendfile on POSIX that broke LogicLib, some documentation improvements and other small touchups.
Download:
http://nsis.sourceforge.net/Download
Release notes: