What are some alternatives?
When comparing Deku and React, you can also consider the following products
Okta - Enterprise-grade identity management for all your apps, users & devices
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
OneLogin - On-demand SSO, directory integration, user provisioning and more
Vue.js - Reactive Components for Modern Web Interfaces
Atlassian Crowd - Crowd is a single sign-on and user identity solution.