LaTeX, markdown, ooxml

HTML/CSS/SVG are superior in every way for document preparation. Very fucking portable (even music players can view HTML now), easy to use, doesn't "fail to compile," more easily extensible with CSS than TeX ever can be, able to make documents scriptable with an innovative functional language (JS)...Seriously, TeX is dead. Stop using it please.

It's also a complete pain to program in.
Because it's not designed for general purpose programming.