For one thing, glow doesn't do math equations.

If this project doesn't have open issues going back a year that are unanswered, it's doing better than glow. I forked glow to fix this one specific rendering bug, because the maintainers didn't respond to my bug report. I can't say that my fork is any better maintained, because no one is using it, but glow isn't maintained and has bugs so I wouldn't hold it up as anything other than abandonware.