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Notepad++ is a free source code editor and Notepad replacement that supports several languages. Running in the MS Windows environment, its use is governed by GPL License.

Quoting from the Notepad++ home page:

Based on the powerful editing component Scintilla, Notepad++ is written in C++ and uses pure Win32 API and STL

The use of Notepad++ is governed by GPL License.

Notepad++ on Wikipedia