Catberry.js

Frontity is a React open-source framework focused on WordPress.

Meteor is an open-source platform for building web, mobile, and desktop applications using JavaScript. It integrates with MongoDB and uses the Distributed Data Protocol and a publish-subscribe pattern to automatically propagate data changes to clients without requiring the developer to write any synchronization code. Meteor allows for rapid prototyping and produces cross-platform code. It's known for its real-time capabilities by default and its ability to create reactive applications with minimal setup.

RedwoodJS is a full-stack serverless web application framework built by Tom Preston Werner (co-founder of Github) et al.