Canjs
Can do JS, better, faster, easier.
Joosy
Joosy is a browser applications framework. That is based on Rails, CoffeeScript and love.
Gijgo
Gijgo - Free Javascript Controls
Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.
Koa
Expressive middleware for node.js using ES2017 async functions
Black Hole.js
Renders black hole gravitational lensing effects in an image canvas using WebGL, glfx.js, and numeric.js
Enyo
A JavaScript application framework emphasizing modularity and encapsulation
Stream Js
JS / Browser Client - Build Activity Feeds & Streams with GetStream.io
Cycle Core
A fully reactive JavaScript framework for Human-Computer Interaction
Angular Meteor
Combining the simplicity and power of AngularJS and Meteor
Stapes
a (really) tiny Javascript MVC microframework
Jsblocks
Better MV-ish Framework
Dojo
Dojo saves you time and scales with your development process, using web standards as its platform. It’s the toolkit experienced developers turn to for building high quality desktop and mobile web applications.
Remote Storage
Client-side Javascript library to make apps compatible with a remote storage.
Inferno
An extremely fast, React-like JavaScript library for building modern user interfaces
Straw
Realtime processing framework for Node.js
Path.js
Simple, lightweight routing for web browsers