NSIS 是“Nullsoft 脚本安装系统”(Nullsoft Scriptable Installation System) 的缩写，它是一个免费的 Win32 安装、卸载系统，采用了简洁高效的脚本方式。它本来是一个由 Nullsoft 创建并用于作为 Winamp 及其插件发布的系统，但现已被上百个应用程序所应用，作为它们进行程序发布的工具。
Changes in version 2.34:
Major Changes
* Modern UI 2: Simpler code, easier to extend and makes use of the faster nsDialogs
Minor Changes
* Added IfNot support for LogicLib (patch #1846785)
* Added some deprecation messages in MUI2 (bug #1784470)
* Allow overwrite of LANGFILE_*_NAME defines in new LangFile.nsh (bug #1848952)
* Better RTL support in instfiles and components page (bug #1841573)
* Fixed deletion of files with relative paths, a.k.a the EVE bug (bug #1851273)
* Fixed input verification of GetCurInstType and GetFullPathName
* Fixed WordFind handling of MBCS characters (bug #1852141)
* Minor documentation improvements (including bug #1842326)
* Use CRLF in examples (bug #1835866)
* Warn of comments containing line-continuation character, only when it really has an effect (bug #1701051, RFE #1686589)
Utilities and Plug-ins
* Added missing stack handling in nsDialogs examples
* Added NSD_GetState for checkboxes and radio buttons, NSD_SetFocus, NSD_CreatePassword and NSD_CreateDropList (patch #1848940)
* Fixed documentation of nsDialogs::SelectFolderDialog (bug #1841120)
* Fixed NSD_CreateComboBox so it'd work like InstallOptions (bug #1851136)
Translations
* Bulgarian updates
* German fixes
Build System
* Fixed build issues on Mac OS (bug #1851365)
* Fixed endianity issues introduced in version 2.32 (bug #1851365)
HomePage: http://nsis.sourceforge.net
Download: NSIS (Nullsoft Scriptable Install System) 2.34