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[1959 users on Ohloh]
Vim is an advanced text editor that seeks to provide the power of the de-facto Unix editor 'Vi', with a more complete feature set. It's useful whether you're already using vi or using a different editor.
GNU Emacs
[572 users on Ohloh]
Emacs is the extensible, customizable, self-documenting real-time display editor.
[524 users on Ohloh]
Notepad++ is a generic source editor (it tries to be anyway) and Notepad replacement written in C++ with the win32 API. The aim of Notepad++ is to offer a slim and efficient binary with a totally customizable GUI.
[281 users on Ohloh]
WinMerge is a tool for visual difference display and merging, for both files and directories. It is highly useful for determing what has changed between file versions, and then merging those changes. WinMerge has Unicode support, Flexible syntax coloring editor, Visual SourceSafe integration, and Windows Shell integration. Regexp filtering for filenames and lines. Side-by-side line difference and highlights differences inside lines. A file map shows the overall file differences in a location pan...
[137 users on Ohloh]
jEdit is an Open Source text editor written in Java. It has many useful features, such as syntax highlighting, bracket matching, regular expression searching, multiple file search and replace, folding, and keyboard macros. jEdit also includes a powerful plugin architecture that allows more than 80 plugins to be downloaded and installed from within the editor.
GNU nano
[124 users on Ohloh]
GNU nano is designed to be a free replacement for the Pico text editor, part of the Pine email suite from The University of Washington. It aims to "emulate Pico as closely as possible and perhaps include extra functionality".
[120 users on Ohloh]
DocBook is an XML/SGML vocabulary that enables you to create document content in a presentation-neutral form that captures the logical structure of the content. Using the DocBook stylesheets, you can publish DocBook content as HTML pages and PDF files and other formats, including man pages, HTML Help, and JavaHelp.
[53 users on Ohloh]
w3m is a pager/text-based WWW browser. It is similar to Lynx, but handles some things like page navigation differently. It can render tables and frames (by converting frames into tables) or display a document given from standard input. It can also be used with mouse in an xterm or in a gpm-driven console, and it is small.
[52 users on Ohloh]
XEmacs is a highly customizable open source text editor and application development system. It is protected under the GNU Public License and related to other versions of Emacs, in particular GNU Emacs. Its emphasis is on modern graphical user interface support and an open software development model, similar to Linux.
[50 users on Ohloh]
Scintilla is a free source code editing component for Win32 and GTK+. As well as features found in standard text editing components, Scintilla includes features especially useful when editing and debugging source code. These include support for syntax styling, error indicators, code completion and call tips. Styling choices are more open than with many editors, allowing the use of proportional fonts, bold and italics, multiple foreground and background colours and multiple fonts.
Open Komodo
[38 users on Ohloh]
The OpenKomodo Open Source Development Environment for Dynamic Languages and Web Technologies

The Open Komodo project provides a code base upon which integrated development environment (IDE) software packages can be developed. ActiveState's Komodo Edit 4.3 and later (an open source, multi-platform, multi-language editor) is an established, mature product that uses the Open Komodo platform.

With the Open Komodo Project, the focus is on dynamic languages and the open web. Open Komodo i...

[27 users on Ohloh]
Lynx is a text web browser under Unix-OS.
[26 users on Ohloh]
BlueCloth is a Ruby implementation of Markdown, a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
Programmer's Notepad
[18 users on Ohloh]
A free, open source, text editor with special features for coders.
[17 users on Ohloh]
Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
Aquamacs Emacs
[17 users on Ohloh]
Aquamacs is an Aqua-native build of the powerful Emacs text editor. By "Aqua-native," we mean more than just the fact that this version of Emacs runs as a standard OS X application. Aquamacs features extensive customization: it will feel and behave mostly like an Aqua program - while still being a real GNU Emacs with all the ergonomy and extensibility you've come to expect from this world-class editor. It's beeen adapted by David Reitter, based on GNU Emacs by Richard Stallman and many others.
JOE - Joe's own editor
[16 users on Ohloh]
JOE is a full featured terminal-based screen editor. JOE has been around since 1988 and comes standard with many Linux distributions.
[12 users on Ohloh]
Yi is a text editor written and extensible in Haskell. The goal of Yi is to provide a flexible, powerful and correct editor core dynamically scriptable in Haskell.
[12 users on Ohloh]
NEdit is a Unix text editor for programmers and general users. It combines a standard, easy-to-use, graphical user interface with the thorough functionality and stability required by users who edit text eight hours a day. It includes a macro language with a complete library of editing functions, state-of-the-art syntax highlighting for 30 common languages and text processors, and the best mouse-interactivity available in a Unix text editor.
[10 users on Ohloh]
Texy is one of the most complex lightweight markup language. It allows adding of images, links, nested lists, tables and has full support for typography and CSS.

Texy allows you to enter content using an easy to read Texy syntax which is filtered into structurally valid XHTML. No knowledge of HTML is required.