eigenmath.js is a Javascript program for evaluating Eigenmath scripts in a browser.
Scripts are read from document.getElementById("stdin").value
Results are written to document.getElementById("stdout").innerHTML
For example (click here to try)
<html>
<body>
<script src="https://georgeweigt.github.io/eigenmath.js"></script>
<textarea id="stdin" rows="24" cols="80" style="font-family:courier;font-size:1em">
-- Eigenmath script goes here
f = sin(x) / x
f
yrange = (-1,1)
draw(f,x)
</textarea>
<button onclick="run()">Run</button><br>
<div id="stdout"></div>
</body>
</html>