Lazy.js
Like underscore.js, but lazier
Refluxjs
A simple library for uni-directional dataflow application architecture inspired by ReactJS Flux
Lint Md
:books: 检查中文 markdown 编写格式规范的命令行工具，基于 AST，方便集成 ci，写博客 / 文档必备。支持 API 调用！
Invisible
Invisible.js: Reusable models for the client and the server
Fluxxor
Flux architecture tools for React
Lucid Js
LucidJS is a chainable event emitter library. It offers several unique features such as set events, emitter piping, DOM node encapsulation, sub events, along with the usual event triggering and binding. LucidJS emitters also feature meta events that allow listening for event binding and event triggering. LucidJS works in both the browser and node.js.
Jquerypp
jQuery's missing utils and special events
Angular History
A history service for AngularJS. Undo/redo, that sort of thing. Has nothing to do with the "back" button, unless you want it to.
Backbone.stickit
Backbone data binding, model binding plugin. The real logic-less templates.
UI Router
The de-facto solution to flexible routing with nested views
Use.js
An AMD/RequireJS plugin for consuming incompatible JavaScript files.
Bottlejs
A powerful, extensible dependency injection micro container for JavaScript applications
Grapnel.js
A simple, lightweight library making it easy to create routes or run events based on a specific URL hashtag.
JS Signals
Custom Event/Messaging system for JavaScript inspired by AS3-Signals
Mediator.js
An implementation of the mediator pattern for asynchronous events in Javascript
Stately.js
Stately.js is a JavaScript based finite-state machine (FSM) engine for Node.js and the browser.