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Sheba Najmileft a comment
NoTex allows you to create high *publication quality* documents that can include things like mathematical formulas. It's impressively built by one person @hkarahan81. It supports Markdown, reST, LaTeX, project-based file management, and Git integration.
NoTexOnline Text Editor for Math Formulas (open source)
NoTexOnline Text Editor for Math Formulas (open source)