Notepad++ is a free source code editor for Windows. The project is hosted on SourceForge.net, from where it has been downloaded over eight million times.
This project, based on the Scintilla editor component, is written in C++ with pure Win32 API calls and uses STL. The aim of Notepad++ is to offer a slim and efficient binary with a totally customizable GUI.

Notepad++ supports syntax highlighting for ActionScript, ASP, Ada, ASCII art, Assembly, AutoIt (Limited support for AutoHotKey), BAT, C, C#, C++, Caml, CSS, doxygen, FORTRAN, HTML, Haskell, Java, JavaScript, KiXtart, Lisp, Lua, makefile, Matlab, Objective-C, Pascal, Perl, PHP, PostScript, Python, Ruby, Scheme, Unix Shell Script, Smalltalk, SQL, Tcl, TeX, Verilog, VHDL, VB/VBScript, and XML.
Furthermore, users can define their own language by using the built-in User Language Define System, which makes Notepad++ extendable, to have syntax highlighting and syntax folding.

Some of its features include:

* Auto-completion (language and file)
* Bookmarks
* Syntax highlighting (and brace and indent highlighting)
* Regular expression find and replace
* Split screen editing
* Zooming
* Spell checker (built in but requires Aspell)
* Hex editor (plug-in available, no longer included in standard installation as of v4.8.2)
* Tabbed document interface
* FTP Browser (plug-in included in standard installation)
* Support for various file formats including unicode.

It has support for macros and plugins. A user-written plug-in called TextFX, which provides many text transformation options, is included by default.