It recommend that you load libraries from the CDN via HTTPS, even if your own website only uses HTTP. Nowadays, performance is fast, and caching works just the same. The CDN’s files are served with CORS and Timing-Allow headers and allowed to be cached for 1 year.
↓ 01 – Google Hosted Libraries
Available Libraries – AngularJS, Angular Material, Angular UI Router, Dojo, Ext Core, Hammer.JS, Indefinite Observable, jQuery, jQuery Mobile, jQuery UI, MooTools, Prototype, script.aculo.us, Shaka Player, SPF, SWFObject, three.js, and Web Font Loader.
↓ 02 – Microsoft Ajax CDN
Available Libraries – jQuery, jQuery Migrate, jQuery UI, jQuery Validation, jQuery Mobile, jQuery Templates, jQuery Cycle, jQuery DataTables, Modernizr, JSHint, Knockout, Globalize, Respond, Bootstrap, Bootstrap TouchCarousel, Hammer.js, ASP.NET Web Forms and Ajax, ASP.NET MVC, and ASP.NET SignalR.
↓ 03 – jsDelivr CDN
Available Libraries – Almost 2000+ projects hosted including jQuery, Modernizr, Bootstrap, Font Awesome, etc.
↓ 04 – cdnjs [ Cloudflare ]
Available Libraries – Almost 3000+ libraries hosted including jquery, angular.js, twitter-bootstrap, font-awesome, moment.js, chart.js, bootstrap-datepicker, react, jqueryui, foundation, normalize, angular-ui-bootstrap, underscore.js, bootstrap-datetimepicker, angular-ui-router, semantic-ui, lodash.js, modernizr, select2, d3, vue, handlebars.js, fancybox, animate.css etc.
↓ 05 – jQuery CDN [ MaxCDN ]
Available Libraries – jQuery Core, jQuery UI, jQuery Mobile, jQuery Color, QUnit, PEP.