Freeware Descriptions:
NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers. It is designed to be as small and flexible as possible and is therefore very suitable for internet distribution.
Here is complete features (taken from authors site):
Being a user’s first experience with your product, a stable and reliable installer is an important component of succesful software. With NSIS you can create such installers that are capable of doing everything that is needed to setup your software.
NSIS is script-based and allows you to create the logic to handle even the most complex installation tasks. Many plug-ins and scripts are already available: you can create web installers, communicate with Windows and other software components, install or update shared components and more.
Features:
- Small overhead size
- Compatible with all major Windows versions
- Unique compression methods
- Script based
- Multiple languages in one installer
- Many features and checks for the target system
- Custom dialogs and interfaces
- Plug-in system
- Support for web installation, file patching
- Project integration, different releases and automatic builds
- Easy and human readable file formats
- Portable Compiler
What’s New in version 2.43:
- This release resolves build issues for some platforms, improves on last version’s new plug-in API a bit and includes the usual bag full of bug fixes and minor improvements.
A few minor changes were made to the new plug-in API that break backward compatibility. Header and library paths were changed and RegisterPluginCallback has changed its return value.
Minor Changes:
- Added WinCore.nsh, WinDef.nsh, WinError.nsh, WinNT.nsh and WinUser.nsh for more useful Windows definitions
- Fixed a crash caused by !packhdr compressing resources (bug #2533431)
- Minor documentation improvements (including bug #2564005)
- Modern UI 2: Fixed MUI_DIRECTORYPAGE_BGCOLOR (bug #2494528)
Utilities and Plug-ins:
- Banner: Fixed installer showing on the background when Banner was used in .onInit
- MakeNSISW: Added Ctrl+K hotkey for build cancelation (RFE #2557392)
- nsDialogs: Added NSD_SetIcon (patch #2500960)
Translations:
- Added Esperanto
- Bulgarian fixes
Plug-in API:
- Added VS2008 project files
- Better installation of header and library files under POSIX - see INSTALL file for more information
- Header and library files were moved to a subdirectory named nsis to prevent collisions
- RegisterPluginCallback now returns int instead of BOOL for a wider range of error reporting
Build System:
- Added fink’s mingw prefixes (bug #2495138)
- Fixed BOOL build issue on OS X (bug #2497290)
- Fixed iconv dependency detection on OS X (bug #2494539)
- Fixed Solaris builds (patch #2497172)

File Size / OS:
- 1.52 MB / Windows 9x - ME - 2000 - NT - XP - 2003 - Vista
Download Nullsoft Install System (NSIS) 2.43: