Pegasus
Load data while still loading other scripts and display data faster in jQuery, Backbone, Angular, ... apps
Conditioner
Frizz Free, Environment-aware, JavaScript Modules
Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.
Pilot
Pilot — multifunction JavaScript router.
Lovli.js
A boilerplate for developing react+redux applications with rethinkdb/horizon as realtime database and express for the server.
Use.js
An AMD/RequireJS plugin for consuming incompatible JavaScript files.
PreloadJS
PreloadJS makes preloading assets & getting aggregate progress events easier in JavaScript. It uses XHR2 when available, and falls back to tag-based loading when not.
Knockout
Knockout makes it easier to create rich, responsive UIs with JavaScript
Twitterlib
Twitter JavaScript API library
Straw
Realtime processing framework for Node.js
Jade
Jade - robust, elegant, feature rich template engine for nodejs
Connective
agent-based reactive programming library for typescript
Dozerjs
Foundational Framework for NodeJS Web Services
Oc Lazy Load
Load modules on demand (lazy load) in AngularJS
Flagsmith Frontend
Web App and Mobile App for Flagsmith
Nunjucks
A jinja2-inspired templating system for javascript