
A text editor is a computer program that allow user to enter, change, store text files.Text editors are often provided with operating systems or software development packages, and can be used to change configuration files and programming language source code.
Finding Useful text editor For Mac OS X was one of the challenging task and here’s what we managed to collect – 12 useful Mac OS X text editors.

ActiveState Komodo Edit is a Free, Open source, multi language text editor which allow you to edit a wide-range of scripting languages including PHP, Python, Ruby, Perl and Tcl, plus JavaScript, CSS, HTML and template languages like RHTML, Template-Toolkit, HTML-Smarty and Django.
It offers sophisticated support for all major scripting languages, including in-depth auto complete and call tips, multi-language file support, syntax coloring and syntax checking, Vi emulation and Emacs key bindings.
Features:

Aquamacs Text editor is a Aqua-native build of the powerful Emacs text editor for Mac OS X. featuring Plug&Play and a Mac-like user interface with pleasant fonts. Extensive customization enables to feel just right and interact well with your other applications. Aquamacs Emacs is best suitable for people who work with Text, HTML, LaTeX, C++, Java, Python, Perl, Ruby, PHP. Aquamacs integrates perfectly with OS X thanks to its specially adapted user interface.

BBEdit is a leading professional HTML and text editor for the Macintosh. it specially designed to give you high-performance features for editing, searching, and manipulation of text. An intelligent interface provides easy access to BBEdit’s best-of-class features, including grep pattern matching, search and replace across multiple files (even unopened files on remote servers), project definition tools, function navigation and syntax coloring for numerous source code languages, code folding, FTP and SFTP open and save, AppleScript, Mac OS X Unix scripting support, text and code completion, and of course a complete set of robust HTML tools.

SKEdit is a simple, flexible and Powerful Text Editor for Mac OS X that specially designed for web designers and programmers. it has many useful features, such as Tabbed interface, Project based site management, Code hinting and completion, Code folding , Code snippets, Syntax highlighting, File uploading and remote editing (using FTP, SFTP or WebDAV), project-wide search-and-replace by using regular expressions, html preview and HTML Tidy integration. skEdit provide Built-in support for ASP, ColdFusion, CSS, HTML, JavaScript, MovableType, Perl, PHP, Python, Ruby and Rails, and SQL .

TextMate is a versatile plain text editor with a unique and innovative feature set which caused it to win an Apple Design Award for Best Mac OS X Developer Tool in August 2006. it support for all major programming languages, writing prose in structured formats such as LaTeX, Markdown, Textile, etc., blogging, running SQL queries, writing screen plays, doing your budget, and much more.
TextMate is not an IDE but by using its powerful snippets, macros, and unique scoping system, it can often provide features that even a language specific IDE lacks. It has enough project management features to keep most users happy, but is otherwise kept lightweight with a clean and minimalistic GUI.

Climacs is an open source Emacs-like text editor written in Common Lisp. it’s free Common Lisp-based text editor that has good integration with other CLIM-based applications. it use Common Lisp Interface Manager (CLIM) library, called ESA, that provides an Emacs-style user interface, rather than the normal CLIM UI.
CodeWarrior Development Studio is a complete Integrated Development Environment (IDE) for the Macintosh that provides a highly visual and automated framework to accelerate the development of the most complex embedded applications.

Diakonos is a free and open source customizable, usable console-based text editor which uses common Macintosh/Windows based keyboard shortcuts – Ctrl-C to copy, Ctrl-V to paste, Ctrl-O to open a file, Ctrl-S to save. It features arbitrary language scripting, a customizable status line, bookmarking, regular expression searching,macro recording and playback, a multi-element clipboard, multi-level undo, a customizable multilingual syntax highlighting, with support for embedded languages, completely customizable keyboard mapping, and customizable syntax highlighting.

jEdit is an open source, cross platform programmer’s text editor written in Java that is customizable with plugins.It has many useful features, such as tabbed window, syntax highlighting, source code editing, File Drawer, none-contiguous layouting, rectangular paste, multiple file search and replace, word completion, smart index menu, smart quote, smart separation between Japanese and English, smart URL link and more. it has powerful plugin architecture that allows to download and installed plugin directly from jEdit using the "plugin manager" feature.

SXEmacs is an open source, highly customizable and extensible real-time text editor and IDE and application development system, with full GUI support.

SAM is an interactive multi-file text editor that combines cut-and-paste interactive editing with an unusual command language based on the composition of regular expressions. It is written as two programs: one, the ‘host part,’ runs on a Unix* system and implements the command language and provides file access; the other,the ‘terminal part,’ runs asynchronously on a machine with a mouse and bitmap display and supports the display and interactive editing.

Smultron is an open source text editor written in Cocoa framework for Mac OS X Leopard 10.5 which is designed to be both easy to use and powerful. it specially designed to give you high-performance features such as edit and save many different file types, Auto completion, Syntax highlighting for many popular programming languages including C, C++, LISP, Java, Python, Ruby, HTML, XML, CSS, Prolog and D, Un/Comment Selection, .Mac Sync, command line utility, Multi-document search and replace with the option to use regular expressions, Show Invisible Characters, Drag-and-drop of files, Code snippets, HTML preview, easy to remove Needless Whitespace, Entab and detab and many more.
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RT @ravindra1982 12 useful Mac OS X text editors http://goo.gl/fb/4C8O
12 useful Mac OS X text editors: A text editor is a computer program that allow user to enter, change, store text… http://bit.ly/byLldS
12 useful mac os x text editors http://feedproxy.google.com/~r/Dreamcssfeed/~3/g8e_JeRPctg/
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you might have included the links!
@vlota first word of description is link to proper text editor website.