Just published my Ajax library. It is very much like jQuery. In fact it is a micro library I built so I would not need to load up jQuery. It comes bundled with FN_Deferred. I admit it is not as full featured as FN_Deferred, but it is very much like jQuery Ajax, and could be the replacement you are looking for.

Go micro, Go Fast.

https://github.com/josephtveter/FN_Ajax

I just published my micro Promise A Library. If you are looking for a micro library for your Deferred Objects look no further. This library was built to support Promise A, can easily replace jquery deferred if you are wanting to lighten the load on your site, and unlike window.Promise it can handle multiple arguments to callbacks. All that and it weighs in about 3kb. Give it a try. https://github.com/josephtveter/fn_deferred

Fractured Nations Common JS Library

After using several Common JS libraries for dependency management I decided that none of them offered me all the things I wanted. I wanted small and fast like Require. I also wanted to load modules like Node and Inject with module.exports. I wanted modules to preload ahead of execution. I also wanted easy path rewrite abilities that Inject offered. And I wanted it easy to understand. So last summer I started building my own. I give you Fractured Nations Common JS. It is a Common JS dependency management library with Deferred Promises, Ajax and custom logging. The Common JS supports require, module.exports, and define. The Deferred Promises support then, done, fail, always, resolve, and reject to be compliant with Promise/A and the Jquery standard if you are in the mood to ditch Jquery. The Ajax library is similar to Jquery but is not very developed. The logging allows you to turn it on and off and set how much logging you desire for certain parts of the code. Give it a spin. There are several examples, including a fully working site that has knockout.js enabled. https://github.com/josephtveter/fn_common