free installers and tools

NSIS 2.0

NSIS 2.0: Nullsoft Scriptable Install System
http://nsis.sourceforge.net/

HM NIS EDIT: A Free NSIS Editor/IDE
http://hmne.sourceforge.net/

Inno Setup

Inno Setup
http://www.jrsoftware.org/isinfo.php

ISTool - GUI tool for edition is scripts
http://www.istool.org/default.aspx/index