Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
Notepad - Most simple text editor. Just plain text, saves in .txt format.
Notepad3 - Notepad3 is a fast and light-weight Scintilla-based text editor with syntax highlighting.
MyTextArea - The world's simplest online text editor.
TED Notepad - TED Notepad is a portable text editor software that deals with a large variety of text processing tools, supplemental text clipboards, high accessibility through hotkeys, and a customizable number of settings and options.
iNotepad - Write and organize all your texts and notes on Mac.