I guess all computer algebra systems have command line interfaces which render formula as 2D monospace "ascii art". But the only standalone tool to render TeX to 2D I know is tex2mail
(comes with PARI/GP).
Are there other standalone programs or libraries for that task, preferably making advantage of various Unicode symbols? Or maybe there is a CAS capable for that.
What I'm talking about:
FriCAS:
┌──┐ x \│%A ┌┐ %e │ ─────── d%A └┘ 2 %A
tex2mail:
+-+ ,- \|x 2 | e /x dx -'
Maxima:
/ sqrt(x) [ %e I --------- dx ] 2 / x
Those are meant to represent:
$\int \frac{e^{\sqrt x}}{x^2} \, dx$