Inno Setup

The de-facto free installer for Windows programs, written in Delphi: single-EXE installers, Pascal scripting for custom install logic, silent installs, multilingual setups, digital signing and per-user or machine-wide installation. Source of the compiler, IDE and setup engine. Licence: custom permissive licence that explicitly allows commercial use, modification and redistribution with attribution

Source: github.com/jrsoftware/issrc · License: see source