If you’ve created a color palette for a website or app, you’ve probably encountered a few of the challenges in creating color palettes for user interfaces. One of the most common challenges is meeting accessibility criteria such as a minimum contrast ratios defined by the Web Content Accessibility Guidelines (WCAG).

A project to make it easier for designers and engineers to leverage color science to create custom interpolations for a value scale, and to make it easier for designers and engineers to conform to WCAG minimum contrast standards by using contrast ratio as the starting point, rather than a post-color-selection auditing process.

If you're using a web font, you're bound to see a flash of unstyled text (or FOUC), between the initial render of your websafe font and the webfont that you've chosen. This usually results in a jarring shift in layout, due to sizing discrepancies between the two fonts. To minimize this discrepancy, you can try to match the fallback font and the intended webfont’s x-heights and widths [1]. This tool helps you do exactly that.

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Porthole is a small Javascript library that makes it safe and easy to communicate with cross domain iFrames. Porthole relies on hidden iFrames (later referred to a as proxy) to exchange information. The caller sets a url fragment with the message to pass. The proxy by virtue of being served from the same origin as the callee, invokes a callback method with an event object that contains the message read from the url fragment. The message signaling mechanism is based on a resize event.

Critical extracts & inlines critical-path (above-the-fold) CSS from HTML

Puppeteer is a Node library which provides a high-level API to control headless Chrome over the DevTools Protocol. It can also be configured to use full (non-headless) Chrome.

A Node queue API for generating PDFs using headless Chrome. Comes with a CLI, S3 storage and webhooks for notifying subscribers about generated PDFs

C3.js D3-based reusable chart library

"Observatory by Mozilla is a project designed to help developers, system administrators, and security professionals configure their sites safely and securely."

AnyProxy is a fully configurable http/https proxy in NodeJS.

Mockaroo lets you generate up to 1,000 rows of realistic test data in CSV, JSON, SQL, and Excel formats.

fony is a simple command line tool that generates dummy JSON data from a provided template.

"Chance is a minimalist generator of random strings, numbers, etc. to help reduce some monotony particularly while writing automated tests or anywhere else you need anything random."

"autovpn is a tool to automatically connect you to a random VPN in a country of your choice. It uses openvpn to connect you to a server obtained from VPN Gate."

Boite à outils PDF pour manipulation des fichiers, en ligne.

"SuperAgent is light-weight progressive ajax API crafted for flexibility, readability, and a low learning curve after being frustrated with many of the existing request APIs."