What are some alternatives?
When comparing Preact.js and Inferno, you can also consider the following products
Vue.js - Reactive Components for Modern Web Interfaces
Deku - Functional view library for building UI components as an alternative to React
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
Riot.js - Riot allows teams to communicate across a wide range of collaboration apps.
Aurelia - Next gen JS framework written with ES6 and ES7. Integrates with Web Components. No external dependencies except polyfills.