Code stuff I've looked at; mostly JavaScript

Only available in Chrome right now.

Could cypress.io be a winner?

A nice guide from Google

https://github.com/Shopify/draggable

Hosting, databases, scaling and more with https://flynn.io/

Locust lets you define user behaviour in Python and then unleash the swarm to test your application.

A practical guide from Jan Grape on Crisp's Blog.

Chromeless runs locally or headless.

Sorted into category, muchos exhaustive

From Feather

A neat tool for art and fun.

This would be quite handy for debugging, web security testing and so on.

Should be required reading for any developer going into an interview. Published on Medium.

Geez it's complicated isn't it? I don't agree with all of the choices in [kamranahmedse's roadmap] but it's an interesting skills overview.

Ponzu is is a powerful and efficient open-source HTTP server framework and CMS.

Use Font Pair by Hayden Mills to choose better pairings of Google Fonts.

Using clever scaling and easing tricks on your CSS @keyframe animations