Notepad++

Notepad++ is a free (as in “free speech” and also as in “free beer”) source code editor and Notepad replacement that supports several languages
Running in the MS Windows environment, its use is governed by GNU General Public License

Based on the powerful editing component Scintilla, Notepad++ is written in C++ and uses pure Win32 API and STL which ensures a higher execution speed and smaller program size
By optimizing as many routines as possible without losing user friendliness, Notepad++ is trying to reduce the world carbon dioxide emissions
When using less CPU power, the PC can throttle down and reduce power consumption, resulting in a greener environment

I hope you enjoy Notepad++ as much as I enjoy coding it