Nullsoft Scriptable Install System

Website: nsis.sourceforge.io

Nullsoft Scriptable Install System (NSIS) is a script-driven installer authoring tool for Microsoft Windows backed by Nullsoft, the creators of Winamp.

NSIS is released under a combination of free software licenses, primarily the zlib license.

It has become a widely used alternative to commercial proprietary products like InstallShield, with users including Amazon, Dropbox, Google, Ubisoft, FL Studio, BitTorrent, and McAfee.