Notepad++ is a free 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. However, as you can see it’s a one-man-project, there are still some bugs and missing features. If you have any question or suggestion about this project, please post them on the forums. As well, if you have any feature requests, you can always make the demand, but there’s no guarantee that I’ll implement it.
Now, it’s my default HTML editor.