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.
This release, NSIS 2.33, includes a quick fix for a display bug introduced in the last version and the fixes and various improvements that were piled in the short week before the bug was discovered.
Download:
http://nsis.sourceforge.net/Download
Release notes: