Riotjs
The 1kb client side MV* library
Inject
AMD and CJS dependency management in the browser
Canjs
Can do JS, better, faster, easier.
jTypes
jTypes is the most comprehensive and robust JavaScript library for overcoming differential inheritance with prototype-based objects. Its lightweight yet powerful design provides web programmers on any platform or browser the ability to emulate classical inheritance where objects are defined by classes.
Tock
Timer Object/Class. Kickass!
Simplate
A simple, but powerful, templating engine for JavaScript.
Min Pub Sub
198 byte publish/subscribe messaging micro-framework
Maria
The MVC framework for JavaScript applications. The real MVC. The Smalltalk MVC. The Gang of Four MVC.
Swig
Take a swig of the best template engine for JavaScript.
JayData
JayData is a unified data access library for JavaScript to CRUD data from different sources like WebSQL/SQLite, IndexedDB, MongoDb, ASP.NET WebAPI, OData, HTML5 localStorage, Facebook or YQL. The library can be integrated with KendoUI, Knockout.js, Handlebars.js or Sencha Touch 2 and can be used on Node.js as well.
Hydra.js
Create a scalable, maintainable and module oriented system using Hydra.js
Flow Js
Javascript Library for Multi-step Asynchronous Logic
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
ifvisible.js
Checks if the current page is visible or not
Wee
Blueprint for modern web development
Functional Js
A functional js library that facilitates currying and point-free / tacit programming
Angular Meteor
Combining the simplicity and power of AngularJS and Meteor