Designed to be completely cross-platform and function on Windows and UNIX

InstallJammer is a multiplatform GUI installer designed to be completely cross-platform and function on Windows and most all versions of UNIX.
InstallJammer features a very powerful install builder with support for multiple themes and a high level of configurability for installers. Installers are built as single executable files for easy distribution over the web and handle installing everything you need for your application in a simple, cross-platform way.