Notepad++
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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 Licence.

Based on a 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.

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
Bookmark
Brace and Indent guideline Highlighting
Macro recording and playback