Essential JS - 60+ stunning, feature-rich JavaScript UI controls
Inferno - An extremely fast React-like javascript library for building modern user interfaces.
Dojo Toolkit - Dojo Toolkit
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
Kendo UI - Fast, light, complete: 70+ jQuery-based UI widgets in one powerful toolset
w2ui - W2UI is a small JavaScript UI library with a complete set of widgets: layout, grid, sidebar, toolbar, tabs, fields, popup, utilities.