Free emacs software for linux

Emacs project is the extensible, customizable, self-documenting real-time display editor.
If this seems to be a bit of a mouthful, an easier explanation is Emacs is a text editor and more. At its core is an interpreter for Emacs Lisp (``elisp, for short), a dialect of the Lisp programming language with extensions to support text editing.
Main features:
- Content sensitive major modes for a wide variety of file types, from plain text to source code to HTML files.
- Complete online documentation, including a tutorial for new users.
- Highly extensible through the Emacs Lisp language.
- Support for many languages and their scripts, including all the European ``Latin scripts, Russian, Greek, Japanese, Chinese, Korean, Thai, Vietnamese, Lao, Ethiopian, and some Indian scripts. (Sorry, Mayan hieroglyphs are not supported.)
- A large number of extensions which add other functionality. The GNU Emacs distribution includes many extensions; many others are available separately--even a web browser.

Firemacs 3.6 will improve your browser's capability greatly. It is designed as a Firefox addon that adds Emacs's editing features. You can also enjoy "less"-like motions in non-input elements.

XEmacs was formerly known as Lucid Emacs and is a powerful, extensible text editor with full GUI support, initially based on an early version of GNU Emacs 19 from the Free Software Foundation and since kept up to ate with recent versions of that product.

XEmacs stems from a collaboration of Lucid, Inc. with Sun Microsystems, Inc. and the University of Illinois with additional support having been provided by Amdahl Corporation, INS Engineering Corporation, and a huge amount of volunteer effort.

C# for Emacs is a derived mode implementing most of the C# rules.

After a good number of years, we noticed that there wasnt a "non-patched" version of a csharp-mode for Emacs.

There were a few, but most of them had comments that they were "in progress" or "about to merge", but then we noticed that those notices were there even after a couple of months.

Then, we saw a request for a csharp-mode on the cc-mode Emacs site, so we decided to follow the rules and create one that required no patching or modification to the core cc-mode engine (which is a good thing). So, this is the C# mode.
There was a 0.3.0 version, but it broke things more than it fixed, so we pulled it.

Zile project is a small Emacs clone. Zile is a customizable, self-documenting real-time open-source display editor. Zile was written to be as similar as possible to Emacs; every Emacs user should feel at home.
Main features:
Small
- It is very useful for small footprint installations (like on floppy disk) or quick editing sessions. A typical binary is about 100Kb.
8-bit clean
- Zile can operate with binary files.
Looks like Emacs
- Most Zile key sequences and function names are identical to Emacs ones.
Multi buffer editing with multi level undo
- The number of files and undo operations that Zile can handle is limited only by memory.
Multi window
- Zile can display multiple windows on the screen.
Killing, yanking and registers
- The standard killing, yanking and register features of Emacs are available under Zile.
Minibuffer completion
- Zile can complete commands and filenames in the minibuffer.
Auto fill (word wrap)
- Zile automatically breaks the lines when they become too wide (if the Auto Fill Mode is enabled).
Enhancements:
- This release stops long file names from causing problems with the modeline.

Versatile Cursors for GNUemacs is a set of emacs commands managing an "item" cursor (e.g. a word, expression, sentence, or defun).
Versatile Cursors for GNUemacs quickly re-assigns the cursor keys between these as needed. Built on this are high-level actions such as converting code blocks to separate functions.
This provides elegant and concise editing, and is pedal- and voice-friendly.
Main features:
- A block (or region) cursor, with motion and text selection by semantically significant units e.g. statements, statement parts, sentences, phrases, table rows and cells
- Editing in terms of these (e.g. ``Make the selected code conditional or ``Delete the selected text)
- Easy access to these through flexible, dynamic, rebinding of the arrow keys and others, with easy ways to navigate the space of possible navigation spaces
- High-level editing operations such as:
- Converting an expression to a local variable initialized to that value
- Converting a block of code to a procedure/function, working out automatically what parameters are required
- Means to access these (and other) navigation and editing commands through a narrow-channel interface such as footswitches (suitable for disability access, including RSI)
- Voice access setup for use with emacs-vr-mode
Enhancements:
- Mostly bug fixes, including a long-standing one for the mode changing wrongly on coming out of the minibuffer.

Easymacs is an easy-to-learn, one-size-fits-all configuration for new users of GNU Emacs. The project sets up key bindings that conform to a common denominator of the Gnome/KDE/OS X/Microsoft Windows human interface guidelines, and provides function-key bindings for other powerful Emacs features.
It is fully documented, and the new user can productively edit text right away, without going through the Emacs tutorial. Many commonly-used functions can be accessed without having to learn the "chords" or multiple keystrokes that Emacs uses by default.
Humanists:
Easymacs was designed with the non-programmer in mind, someone who would like to use Emacs to edit mainly text files, especially LaTeX and TEI-conforming XML. Since many aspects of the configuration of Emacs require a certain knowledge of programming, this sort of person might find the default behavior of Emacs too foreign and too hard to reconfigure.
Programmers:
On the other hand, Easymacs is also a great environment for programmers who would like to use Emacs, but dont want to spend the time in learning how to configure it.
Main features:
- All of the usual features of an editor: undo, redo, search and replace, intelligent indentation and wrapping.
- Spell-checking as you type. This distinguishes between true misspellings and words which are used more than once in a file, and so are likely to be correct but unknown. You can correct misspellings with a single keystroke (F8).
- There are many convenient ways of entering non-ASCII text, including Unicode and various exotic encodings.
- Rectangular selection of text, which can be also used to insert the same text in many columns (Ctrl-Return).
- Most file-types define syntax-sensitive folding (F7).
- Visible, persistent bookmarks to mark particular lines in a file (Alt-F2).
- You can search for text in multiple files in a given folder or set of subfolders (Ctrl-Shtf-F9). The output displays a menu of the lines in the different files that match a your pattern, and you can jump from one to the next with a single keystroke (F10 or Alt-`).
- Auto-completion of words based on the content of other open files (F5), or on a dictionary (Shft-F8).
- Multiple cut and paste clipboards (just hit Ctrl-number before cutting, copying or pasting, and the commands will use the clipboard numbered 0-9 for that operation).
- History of clipboard contents: you can browse through the past contents of the clipboard and insert any one of the previous contents (Shft-Ctrl-V).
- Keyboard macros that let you record (Alt-Shft-F5) and play back (Alt-F5) a series of keystrokes, to ease repetitive tasks.
- You can look up the word at the cursor in dictionaries and thesauri with a single keystroke (Alt-F8).
- You can easily switch between open files via a menu (F9), or other quick shortcuts (Shft-F9, Ctrl-F9). There is also a menu of recently opened files (Alt-Shft-F1).
- There is a full command shell for manipulating files and running commands. (Alt-F9).
Enhancements:
- A number of small updates and additions were made.
- At a minimum, the forthcoming Emacs 22 is required.

GNU TeXmacs is a free scientific text editor, which was both inspired by TeX and GNU Emacs. The editor allows you to write structured documents via a wysiwyg (what-you-see-is-what-you-get) and user friendly interface.
New styles may be created by the user. GNU TeXmacs implements high-quality typesetting algorithms and TeX fonts, which help you to produce professionally looking documents.
The high typesetting quality still goes through for automatically generated formulas, which makes TeXmacs suitable as an interface for computer algebra systems. TeXmacs also supports the Guile/Scheme extension language, so that you may customize the interface and write your own extensions to the editor.
Converters exist for TeX/LaTeX and they are under development for Html/MathML/Xml. In the future, TeXmacs is planned to evolve towards a complete scientific office suite, with spreadsheet capacities, a technical drawing editor and a presentation mode.
Enhancements:
- The user interface for the graphical mode has been simplified and the Maxima interface has been updated.
- Further progress was made for the upcoming new GUI.