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LyX is a document processor that encourages an approach to writing based on the structure of your documents (WYSIWYM) and not simply their appearance (WYSIWYG).

LyX combines the power and flexibility of TeX/LaTeX with the ease of use of a graphical interface. This results in world-class support for creation of mathematical content (via a fully integrated equation editor) and structured documents like academic articles, theses, and books. In addition, staples of scientific authoring such as reference list and index creation come standard. But you can also use LyX to create a letter or a novel or a theatre play or film script. A broad array of ready, well-designed document layouts are built in.

LyX is for people who want their writing to look great, right out of the box. No more endless tinkering with formatting details, “finger painting” font attributes or futzing around with page boundaries. You just write. On screen, LyX looks like any word processor; its printed output — or richly cross-referenced PDF, just as readily produced — looks like nothing else.

LyX is released under a Free Software/Open Source license, runs on Linux/Unix, Windows, and Mac OS X, and is available in several languages.

Features:

LyX is a fully featured document processor. Here are some of the features, classified by category.

Math/science features (demo clip)

* Mathematical formula editor which is easily best of breed. Fully harnesses the power of LaTeX.
* Equations can be entered via point-and-click interface or via keyboard with LaTeX commands (optionally via auto-completion). Formulas are immediately visually rendered on screen.
* Copy/paste to and from LaTeX source code.
* Equation arrays, equation numbering, theorems, customizable math macros, matrices, algorithms, and much more.
* Support of math macros
* Basic support for various Computer Algebra Systems (CAS) - Maple, Maxima, Octave, Mathematica

Structured document creation

* Advanced features for labels, references, index and bibliography (including advanced BibTeX support)
* Standard word processor operations, like cut/paste, multiple open documents, undo/redo, spellchecking (uses aspell or hunspell in the background), thesaurus and revision tracking
* Different textclasses allow you to type letters, articles, books, movie scripts, LinuxDoc, slides, presentations. Also included are some textclasses for scientific societies, such as AMS, APS, IEEE, or specific journals like Astronomy and Astrophysics.
* Dedicated modules let you dynamically enhance the functionality of the textclass by adding features that are needed for specific tasks (such as endnotes, linguistic glosses, Noweb/Sweave or LilyPond support)
* Numbered section headings, table of contents (with hypertext functionality), lists of figures/tables
* The outliner mode allows for easy navigating in your document as well as for moving or nesting complete chapters and sections
* Character styles provide access to fully semantic markup

Graphics/tables

* Support for many graphic formats (including EPS, SVG, XFig, Dia and others)
* WYSIWYG for cropping, rotation, scaling of images
* Enhanced support for intelligently floating figures and tables
* Support for subfigures, subtables and captions
* Support for wrapped figures and tables
* Interactive WYSIWYG tables
* Shared (geometry) settings for multiple figures

Internationalization

* Support for writing documents in many languages of the world
* Bidi support for Right-to-Left languages such as Hebrew and Arabic
* Support for many writing systems (including CJK)
* Write multilingual documents consisting of diverse languages and scripts thanks to unicode compliance.
* Menus, error messages, manuals and key bindings are available in many languages