matcha.css is a pure CSS library designed to style HTML elements similarly to a default browser stylesheet, eliminating the need for users to manually patch their documents. Ideal for fast prototyping, static HTML pages, Markdown-generated documents, and developers seeking to streamline their workflow without delving into CSS intricacies and want to make use of the full range of available HTML elements.

Reason lets you write simple, fast and quality type safe code while leveraging both the JavaScript & OCaml ecosystems. Reason is not a new language; it's a new syntax and toolchain powered by the battle-tested language, OCaml. Reason gives OCaml a familiar syntax geared toward JavaScript programmers, and caters to the existing NPM/Yarn workflow folks already know.

Day.js is a minimalist JavaScript library that parses, validates, manipulates, and displays dates and times for modern browsers with a largely Moment.js-compatible API. If you use Moment.js, you already know how to use Day.js.