Consumerjs simplifies REST with an ORM like approach. Built on top of Axios.
DOM selection and manipulation using BEM (Block, Element, Modifier).
Dual listbox for multi-select elements
Django Admin like generation for formsets
Lazy loading, easy to use wrapper around the Google Maps API.
Allows/disallows using certain selector types (type, .class, #id, *universal [attribute] :pseudo) at either global or local level (.global > .local).
Sass microframework for building scoped user interfaces.