From author's site:
Notepad++ is a free (free as in "free speech", but also as in "free beer") source code editor and Notepad replacement, which supports several programming languages, running under the MS Windows environment.
This project, based on the Scintilla edit component (a very powerful editor component), written in C++ with pure win32 api and STL (that ensures the higher execution speed and smaller size of the program), is under the GPL Licence. This project is mature.
Here are the features of Notepad++ :
Syntax Highlighting and Syntax Folding
WYSIWYG
User Defined Syntax Highlighting
Auto-completion
Multi-Document
Multi-View
Regular Expression Search/Replace supported
Full Drag ‘N' Drop supported
Dynamic position of Views
File Status Auto-detection
Zoom in and zoom out
Multi-Language environment supported
Bookmarks
Brace and Indent guideline Highlighting
Macro recording and playback
User Defined Syntax Highlighting
Auto-completion
Multi-Document
