NSIS (Nullsoft Scriptable Install System) is a fully professional, free system that allows you to create installers for Windows systems. The appearance and functionality of the installer can be freely adjusted to the needs of the application. For example, during the installation process, the installer can download the necessary libraries that are required to run the program or check if there is a newer version to download.

Creating multilingual installers is not a problem either, because NSIS has more than 35 ready-made translations. In version 2 the programmers added a new LZMA data compression system, giving a 20% better result than the previous BZip2. Using Nullsoft Scriptable Install System you have created installers for such applications as WinAmp or eMule.