Hibiol Wiki
MathExpressions
It is possible to write equations like so:
y = sum_x 1/2 x + c
This uses AsciiMath.
$$$MATH$$$y = sum_x 1/2 x + c$$$ENDMATH$$$
To see how each page is made see the source!
Feel free to clone it to try Hibiol and edit it! Details on how to use are in GettingStarted
You can also see the source code to Hibiol itself