Notepad ++

Notepad ++ is a source code editor and notepad replacement that includes a wealth of advanced features and support for many popular programming languages. If offers customizable syntax highlighting, code completion, macro recording and playback, search/replace (with support for Regular Expressions), code collapse, multi-view editing, tag matching, a tons of text processing function, and a lot more. Notepad++ can be further extended by using freely available plug-ins that allow you to add spell checking, debugging and many other features.