Notepad++ is a free source code editor (and Notepad replacement), which supports several programming languages.
Not in the Top 100 in 2013
Comments from some of those who selected Notepad++ as one of their Top Tools
“Best simple text editor on Windows, hands down. Plus its free!” Tim Kindberg
” I use the portable version that I keep on a jump drive that I can use for simple text editing. Like Notetab it has tabs capability to have more than one file open at a time” Dennis Coxe