| Welcome NSIS is a free win32 installer/uninstaller system. NSIS installers are based on NSIS Scripts (.nsi) which can be compiled with the makensis compiler. You can create both simple installers and installers that handle lots of advanced tasks. Installers can also be extended with plugins written in C, C++ or another language. This menu contains links to applications, websites and documentation that will help you to create your installers.