Free Software for JavaScript
Whitestorm.js
WhitestormJS is a free and open source framework that can be used to build 3D web applications using Three.js technology. WhitestormJS uses Three.js for rendering your scene and objects and Physi.js for simulating physics. Both those libraries are already included in the build and should work properly out-of-the-box. Developers use WhitestormJS to build interactive 3D applications for the web.
dORM
dORM is a lightweight SQL query builder for Deno and PostgreSQL and is currently being expanded into a full-fledged object-relational mapping (ORM) tool. Its purpose is to make your life easier when making SQL queries and let you write queries in familiar Javascript/Typescript syntax and dot notation.
RequireJS
RequireJS is a free and open-source JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Node.js and Rhino.
nest.land
A blockchain-based package registry for Deno. nest.land combines Deno with the Arweave Blockchain to create a decentralized package registry for Deno. With nest.land developers can publish immutable Deno packages that can never be deleted and easily used for any Deno-powered software project.
knex.js
Knex.js is a free and open-source JavaScript query builder for relational databases. The query builder supports Postgres, MSSQL, MySQL, MariaDB, SQLite3, Oracle, and Amazon Redshift and is designed for easy-of-use and portability. Knex.js can be used with both callbacks and promises and supports transactions and connection pooling while providing async flow control, a stream interface, fully featured query and schema builders.
Pakyow
Pakyow is a framework for building modern websites and web apps. Views update in realtime to stay in sync with backend state. This is done using a traditional, backend-driven architecture, which means business logic is written once and stays on the server (write no JavaScript).
Socket.io
Socket.IO is a free and open-source JavaScript library that can be used for building realtime web applications. The library consists of two parts, a server-side library for Node.js and a client-side library that runs in the browser.
Webiny
Webiny is a free and open-source static site generator and headless CMS written in JavaScript.
Handlebars.js
A Mustache-compatible, minimal templating library for JavaScript. With Handlebars.js you build semantic templates effectively and minimize frustration. Handlebars.js compiles templates into JavaScript functions, while making template execution faster than most other template engines available for JavaScript.