ColorZilla includes an eyedrop colour selector, a colour history tool, a CSS gradient analyzer and a page analyzer that assesses colours on a web page.
Dimensions is a very useful Chrome developer extension if you want to measure spacing, dimensions, gaps between page elements and anything else you see on the page.
Daily. dev is news aggregator that specializes in development news. It showcases a page full of news stories, blog posts and useful pages on our chosen subject.
ColorPick Eyedropper is a useful Chrome developer extension because it can quickly identify any colour on any web page and zooms in so you can even select a border 1px wide.
Lighthouse is an open-source, automated tool for improving the quality of web pages. It has audits for performance, accessibility, progressive web apps, SEO and more.