NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution.
Being a users first experience with your product, a stable and reliable installer is an important component of successful software. With NSIS you can create such installers that are capable of doing everything that is needed to setup your software.
NSIS is script-based and allows you to create the logic to handle even the most complex installation tasks.
Portable Version:
http://portableapps.com/apps/development/nsis_portable
Comments and Reviews
Good platform for developers. My team uses this service and likes the way it works. I recommend you to try it out!
Very powerful install system! Has plugin for Eclipse. Totally scriptable. 100% localizable - support huge amount of predefine language packs. It took me one day to write the installer, but it's really good, and 100% free!