Thinkjs
Use full ES2015+ features to develop Node.js applications, Support TypeScript.
Nunjucks
A jinja2-inspired templating system for javascript
Hinclude
declarative client-side inclusion for the Web
Eve.js
A <3kb JavaScript file providing three simple methods to organize code into CSS namespaces which magically restrict code to the current context, allowing for dramatic reductions to code size and development time.
Sentry
Sentry is a realtime error logging and aggregation platform
Functional Js
A functional js library that facilitates currying and point-free / tacit programming
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Angular Meteor
Combining the simplicity and power of AngularJS and Meteor
Hermes.js
Message and Error logger implementation
Tungstenjs
Tungsten.js is a modular framework for creating web UIs with high-performance rendering on both server and client.
T.js
A tiny javascript templating framework in ~400 bytes gzipped
Robotjs
Node.js Desktop Automation.
Paperclip.js
reactive DOM template engine built for speed, and extensibility
YUI3
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!
Prime
an OOP javascript library for node.js and the browsers
Invisible
Invisible.js: Reusable models for the client and the server