LyX is described as '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 GUI' and is a very popular LaTeX Editor in the office & productivity category. There are more than 25 alternatives to LyX for a variety of platforms, including Windows, Mac, Linux, Web-based and Self-Hosted apps. The best LyX alternative is Overleaf, which is both free and Open Source. Other great apps like LyX are Texmaker, TeX Live, Kile and TeXmacs.
Overleaf, formerly WriteLaTeX, is a collaborative writing and publishing system that makes the whole process of producing academic papers much quicker for both authors and publishers.
Texmaker is a free LaTeX editor, that integrates many tools needed to develop documents with LaTeX, in just one application.
TeX Live is an easy way to get up and running with the TeX document production system. It provides a comprehensive TeX system with binaries for most flavors of Unix, including GNU/Linux, and also Windows.
Kile is a user-friendly TeX/LaTeX editor by KDE. Kile gives you the ability to use all the functionality of LaTeX in a graphical interface and has interactive preview mechanisms to readily see the results of editing.
GNU TeXmacs is a free scientific editing platform designed to create beautiful technical documents. It provides a unified and user friendly framework for editing structured documents with different types of content: text, math, graphics, slides, etc.
MiKTeX is a typesetting system for the Windows operating system. The distribution includes TeX, pdfTeX and XeTeX.
Authorea is the online document editor for researchers that allows researchers to write, cite, host data, and publish research documents. Authorea is trusted worldwide by leading researchers writing and publishing content in every discipline, from astrophysics to zoology.
KLatexFormula is an easy-to-use graphical application for generating images (that you can drag and drop, copy and paste or save to disk) from LaTeX equations. It is written in Qt4.
You write text and mathematics in your document without having to know a programming language or exit to an equation editor. Evaluate, simplify, solve, and plot functions without the need to master a complex syntax.
A desktop publishing (DTP) and word processing application that is popular for large documents.
BaKoMa TeX system for Scientific Publishing. One of its main features is instant preview: The document is typeset as you write, providing true WYSIWYG experience not usually found in LaTeX editors.
LaTeXing is plugin for the popular and fast text editor Sublime Text . The plugin supports many features to write your LaTeX files without leaving the text editor or using the mouse.
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Specially useful if you need to produce academic and or technical documents in multiple platforms. Overleaf also has good collaboration tools and supports GitHub.