From QtCentreWiki

Installer generators allow you to wrap all your program files into a single file that can be distributed easily. The generated installer also takes care of creating start menu shortcuts, installing services, setting environment variables and so on.

Open Source

Multiplatform

• IzPack — a Java-based installer generator.
• InstallJammer — a Tcl/Tk multiplatform installer.
• CPack.

Windows only

• InnoSetup — includes a Pascal engine.
• NSIS — has extremely low overhead.

Proprietary

Multiplatform

• BitRock InstallBuilder for Qt — allows creating native installers for Qt applications. Free licenses are available for Open Source projects. Used by Qt Creator
• Acresso InstallAnywhere — a Java-based multiplatform installer.

Windows only

• Acresso InstallShield — Windows-only installer from Acresso.
• Visual Studio 2005/2008 Standard and up — Includes "Setup" project types to create .msi installers.