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. It allows a user to edit the different document in the same time and even to edit the same document synchronizely in 2 different views.
It also gives the extra functionality to define a user’s own language for the syntax folding and syntax highlighting. Notepad++ is a free source code editor (Notepad replacement), which supports several programming languages, running under the Microsoft Windows environment.