Verlet.js (pronounced ‘ver-ley’) is a Verlet integration physics engine written in JavaScript.

Verlet.js can handle simulations, composites, particles and constrains. From these you can make just about anything, the sky is the limit. Its parts intertwine very well: for example, you can link particles together so they interact.

brain.js is a JavaScript library for creating simple neural networks.

brain.js has a demo page where you can train a neural network to recognize color contrast.

Of course you can also create a simple neural network to give human input to tasks you couldn’t rely on computer expertise.

BaldrickJS is a JavaScript framework for creating ajax requests.

BaldrickJS works by incorporating the request into an element on the website. The requests requires a trigger, a resource and a target – pretty easy. It’s a nice solution, but I’d like to see how the library handles dynamic requests.

Unirest is a set of lightweight HTTP libraries for various programming languages.

Unirest makes sending GET, POST, PUT, and other requests much easier in all of the supported languages.

The libraries are easy to use and documented fairly well. While Unirest is but an enhancement of existing features which weren’t that hard to use in the first place (for PHP at least), the library still seems very helpful.

TowTruck is a web service for collaborating on the web. It’s made by Mozilla and is used to quickly get together to look over a webpage with numerous users.

You can install TowTruck by dropping a single of code into a webpage and creating a button that activates the app.

Once activated, you can send collaboration links to other people and they’ll be able to jump into the action — chat, highlight points of discussion and even talk through the microphone.

TowTruck is useful for web developers and designers, but even regular visitors can use this tool to discuss an article or a research paper right in the browser.

Cavendish is a CoffeeScript/jQuery plugin for adding functionality to your slides (to turn them into a slider).

Cavendish can create four types of sliders: paginated, pan, arrow-controlled and simple sliders.

The plugin doesn’t try to polyfill for older browsers or provide extra features. It’s a very basic slide controller, and you might just prefer it for its simplicity.