Recommend NOTEPAD++

Notepad++ is a free source code editor (and Notepad replacement), which supports several programming languages, running under the MS Windows environment.

I like some features very much, such as:

(1) Syntax Highlighting and Syntax Folding
Supported languages : C, C++, Java , C#, XML, HTML, PHP, Javascript, RC resource file, makefile, ASCII art file, Fortran, doxygen, ini file, batch file, ASP, VB/VBS source files, SQL, Objective-C, CSS, Pascal, Perl, Python, Lua, TeX, TCL, Assembler, Ruby, Lisp, Scheme, Properties, Diff, Smalltalk, Postscript, VHDL, Ada, Caml, AutoIt, KiXtart, Matlab and Verilog.

(2) Function Listing

Recommend versions>=4.0. It can be executed under Unix/Linux using Wine (the latest release).