A lot of people mentioned other immutable JS libraries after reading [my post](http://jlongster.com/Using-Immutable-Data-Structures-in-JavaScript).
I thought it would be good to make a list of available ones.

There are two types of immutable libraries: simple helpers for copying JavaScript objects, and actual persistent data structure
implementations. My post generally analyzed the tradeoffs between both kinds of libraries and everything applies to the below
libraries in either category.

Libraries are sorted by github popularity.

## Persistent Data Structures w/structural sharing

* [immutable.js](http://facebook.github.io/immutable-js/) - Facebook's implementation with a JS-like API
* [mori](https://github.com/swannodette/mori) - ClojureScript's persistent data structures exported to JS

Other libraries built on top of immutable.js: [typed-immutable](https://github.com/Gozala/typed-immutable) and [immstruct](https://github.com/omniscientjs/immstruct)

## Immutable helpers (simply shallow copy JS objects)

* [React's immutability helpers](https://facebook.github.io/react/docs/update.html)
* [baobab](https://github.com/Yomguithereal/baobab)
* [react-cursor](https://github.com/dustingetz/react-cursor) (cursors)
* [seamless-immutable](https://github.com/rtfeldman/seamless-immutable)
* [cortex](https://github.com/mquan/cortex) (cursors)
* [tcomb](https://github.com/gcanti/tcomb) (typed data)
* [icepick](https://github.com/aearly/icepick)
* [mutatis](https://github.com/steadicat/mutatis)