NOTEPAD++ (Source code editing tool)

Don't be fooled by the name. Based on powerful editing component scintilla, Notepad++ is a powerful source code editing tool and also functions as a notepad enhancement. It supports mostly all the major programming language like c, c++, java, perl, html, css etc.

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Some of its general features include

Tabbed document interfaceDrag-and-drop
Multiple Clipboard (plugin required)
Split screen editing and synchronized scrolling
Spell checker (requires Aspell) (Spell checker does not distinguish between text and code)
Supports text encoding formats such as Unicode, for international writing systems
Find and replace over multiple documents
File comparison
Zooming


It has great source code editing features like

Auto-completion
Bookmarks
Syntax highlighting and syntax folding
Brace and indent highlighting
Regular expression find and replace
Speech synthesis
FTP Browser (plug-in included in standard installation)
Macro recording and execution.
Various tools such as line sorting, text encoding conversion, text folding
File status auto-detection
Plugins for multiline regular expression search and replace