The best open source alternative to LyX is Overleaf. If that doesn't suit you, our users have ranked more than 25 alternatives to LyX and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to 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.
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.
VimTeX is a Vim plugin that provides support for writing LaTeX documents. It is based on LaTeX-Box and it shares a similar goal: to provide a simple and lightweight LaTeX plugin. It has been rewritten from scratch to provide a more modern code base.
The TeXworks project is an effort to build a simple TeX front-end program (working environment) that will be available for all today’s major desktop operating systems—in particular, MS Windows (XP and Vista), typical GNU/Linux distros and other X11-based systems, and Mac OS X.
TeXnicCenter is a feature rich and easy-to-use integrated environment for creating LaTeX documents on the Windows platform. Its powerful editor and its tight integration with the LaTeX environment helps you to concentrate on what matters: The content of your document.
SwiftLaTeX is a Web-browser based editor to create PDF documents such as reports, term projects, slide decks, in the typesetting system LaTeX. In contrast to other web-based editors SwiftLaTeX is true WYSIWYG, What-you-see-is-what-you-get: You edit directly in a representation...
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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.