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There are several that do it, this article mentions a few and shows how to do it in xterm.

http://www.stenyak.com/archives/1208/trick-of-the-day-render...

Not mentioned in that article, there's also Terminology, which can display all sorts of dynamic media and things.

https://www.enlightenment.org/p.php?p=about/terminology

I remember there used to be a DVI viewer for xterm's tektronix mode. It would render the fonts by drawing a sequence of horizontal lines for runs of pixels.

It's a shame nothing ever came of TermKit.

http://acko.net/blog/on-termkit/

Nice. I just plotted an image older than myself (/usr/share/doc/plotutils/tek2plot/dmerc.tek.gz)!

Okay, Terminus looks pretty good. I wish rxvt could do this, too. Thanks for those links.

If Linux is booted with vesafb enabled, many programs can draw graphics without using X.

https://en.wikipedia.org/wiki/Linux_framebuffer

SDL and SVGAlib http://www.libsdl.org/ http://www.svgalib.org/