LyX – The Document Processor
TeXmacs is better. Check out this video: https://www.youtube.com/watch?v=mlcqGRv7xhcUnlike LyX, TeXmacs actually has WYSIWYG editing. LyX only provides a rough approximation of the output.Moreover, the real-time typesetter in TeXmacs rivals the output of TeX/LaTeX. In some ways, it is better.