LibreOffice has had this for some time: http://roland65.free.fr/texmaths/ http://roland65.free.fr/texmaths/ I do most of my serious typesetting in LyX, so I h

LibreOffice has had this for some time: http://roland65.free.fr/texmaths/ http://roland65.free.fr/texmaths/ I do most of my serious typesetting in LyX, so I haven't done much with TeXMaths, but I've used it a little bit. It seems pretty nice: you can have a custom preamble and custom packages (although you'll probably have to link the .sty files you need into the directory where the document lives).