It's FOSS - https://itsfoss.com/latex-editors-linux/
Brief: Once you get over the learning curve, there is nothing like LaTex. Here are the best LaTex editors for Linux and other systems.
What is LaTeX?
LaTeX is a document preparation system. Unlike plain text editor, you can’t just write a plain text using LaTeX editors. Here, you will have to utilize LaTeX commands in order to manage the content of the document.
LaTex code compiled into a document
LaTex Editors are generally used to publish scientific research documents or books for academic purposes. Most importantly, LaText editors come handy while dealing with a document containing complex Mathematical notations. Surely,