### Basic Viewing and Editing
- pencil.rs for basic framework?
- tera for jinja2 (or just use pencil's handlebars default)
- generic style: http://bootswatch.com/simplex/

editing markdown etc:
- https://github.com/benweet/stackedit: markdown, very fancy
- https://ace.c9.io: simple code-oriented
- http://dillinger.io/
- https://github.com/benweet/stackedit
- vue.js

### Dynamic Essay

http://worrydream.com/Tangle/guide.html
hyperphysics

#### Charting/Rendering

plotly.js: d3.js and stack.gl
    https://plot.ly/javascript/
    https://github.com/plotly/plotly.js


##### GUI Demos

numeric.js
    Has an ODE solver. Use with Elm?

Tangle.js
    Brett's JS widget-y thing. Very simple.
    How did he do plots/graphs for those demos?
    http://worrydream.com/Tangle/guide.html

KaTeX LaTeX rendering
    Faster than mathjax?
    https://github.com/Khan/KaTeX