Tool

The Texts software (http://www.texts.io/) is so far the best writing tool I have ever used. You writing is in markdown format, and looks in plain text in the software. The back-end is the powerful pandoc. It can transfer your writings into PDF and HTML files with embedded math and algorithm expressions in latex. It also works well for Chinese texts with the xelatex. It has to have latex systems installed previously on your system.

You need a default template for exporting to a PDF. I link one here (Default.xelatex), which I used for writing Chinese scientific texts. A helpful reference is a xelatex thesis template, especially in its setup/package.tex, the site link.

Citation styles used in pandoc can be found richly on this site, https://github.com/citation-style-language/styles. It includes a few Chinese journal citation styles.

Other tools such as JabRef for bibliography management in bibtex; LaTeXDraw for latex graphics.