Free Software for JavaScript
Ant Design
Ant Design is a open-source React UI library and design system that comes packed with plethora of easy-to-use components. The framework consist of UI components that are free to use for any project. Currently Ant Design is used to create UIs for big Chinese companies like Alibaba, Tencent and Baidu. Ant Design provided a suite of out-of-the-box components that are ready to use even on an enterprise-level.
Webpack
Webpack is an open-source module bundler for JavaScript. Its main purpose is to bundle JavaScript files for usage in a browser, yet it is also capable of transforming, bundling, or packaging just about any resource or asset. It can transform front-end assets like HTML, CSS, and images where corresponding loaders ar included and takes modules with dependencies and generates static assets representing those modules.
Wiki.js
With Wiki.js you can run a blazing fast Wiki built with performance in mind. Wiki.js is an extensible, free and open source Wiki software written in JavaScript. Wiki.js brings a modern approach to documentation and Wiki writing, it provides a simple to use WYSIWYG editor, a Markdown editor and a visual builder to please all types of workflows. All content moderation is also tracked on a Wiki.js-powered site, which means that you can an revert to a previous state or recover a deleted page at any time and get a broad overview of content evolution. Allowing you to visually compare two versions of the same page to see exactly what changed. Wiki.js runs on virtually any platform and is compatible with either PostgreSQL, MySQL, MariaDB, MS SQL Server or SQLite.
AlaSQL
AlaSQL is a free and open-source lightweight client-side in-memory SQL database designed to work in browser and Node.js. The database is written in JavaScript and does not use the browsers WebSQL database. The AlaSQL server is fully functional and supports JOINs, GROUPs, UNIONs, ANY, ALL, IN, subqueries and very limited transactions support.
Rome
Rome is a free and open-source JavaScript build tool that has strong conventions and aims to have minimal configuration. The toolset includes a linter, compiler and bundler for JavaScript, TypeScript, JSON, HTML, Markdown, and CSS. Rome has zero dependencies, and has largely been written from scratch by people from Facebook.
Vizzu
Vizzu is a free, open-source Javascript/C++ library utilizing a generic dataviz engine that generates many types of charts and seamlessly animates between them. It can be used to create static charts but more importantly it is designed for building animated data stories and interactive explorers as Vizzu enables showing different perspectives of the data that the viewers can easily follow due to the animation.
Snowpack
Snowpack enables frontend developers to enjoy a lightning-fast development experience. It's modern build tool that replaces heavier, more complex bundlers like Webpack or Parcel in your development workflow. Snowpack leverages JavaScript's native module system to increase performance and never builds the same file twice. Allowing you to enjoy a near instant hot module reload and refresh no matter how big your project grows. Snowpack supports JSX, TypeScript, React, Preact, CSS Modules and much more, while also provding an extensive plugin catalog with support for almost any technology in the JavaScript eco-system.
SvelteKit
SvelteKit is a free and open-source framework used to create SSR, Static and Serverless web applications with Svelte. SvelteKit aims to replace Sapper and in the process unify the eco-system and have a single way to start building apps with Svelte. This will simplify on-boarding, and reduce maintenance and support burden for the core developers. SvelteKit fully embraces the serverless paradigm and has support for all the major serverless providers. Under the hood, SvelteKit uses Snowpack in development and compiles and hot reloads your code near instantly, making it an extremely pleasant developer experience.
Gulp.js
A toolkit to automate & enhance your workflow. Leverage gulp and the flexibility of JavaScript to automate slow, repetitive workflows and compose them into efficient build pipelines.
NativeScript
NativeScript is an open-source framework that you can use to develop mobile apps on the Apple iOS and Android platforms. The framework is developed and released by Progress, a software development company providing a wide range of SaaS-based products. NativeScript apps are built using JavaScript, or by using any programming language that transpiles to JavaScript, such as TypeScript.