Notepad++ is a good free text editor for programmer, which supports several programming languages and has many cool features.

Screenshot

Features

- 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
- Bookmark
- Brace and Indent guideline Highlighting
- Macro recording and playback

Support language

C C++ Java C# XML HTML
PHP CSS makefile ASCII art (.nfo) doxygen ini file
batch file Javascript ASP VB/VBS SQL Objective-C
RC resource file Pascal Perl Python Lua TeX
TCL Assembler Ruby Lisp Scheme Properties
Diff Smalltalk Postscript VHDL Ada Caml
AutoIt KiXtart Matlab Verilog Haskell InnoSetup
CMake

Plugin

Notepad++ also has many free plugin such as Function lists, Insetion, XML tool, Hex editor and more, you can see on a donwload page.