A few libraries that are not so well known but which I have found to be very useful:
| Library | Description |
|---|---|
| Route parser | Framework independent, isomorphic routing library with route parsing, matching, and importantly - reversing |
| SPF.js | A library from youtube team for fast navigation and incremental loading with progressive enhancement |
| Mori | Port of clojure immutable data structures |
| Prelude.ls | Utilities for functional programming, implemented in livescript but usable from javascript |
| Golden Layout | Powerful and elegant layout management for dashboards and monitoring systems |
| jquery-ujs | Unobstructive scripting library that enables a lot of nifty features without needing javascript. This is well known in the rails community but does not have much exposure outside. |
| html-to-vdom | Library for converting html to virtual DOM. Useful in some obscure situations when generating HTML from a library like React is not an option. |