What are some alternatives?
When comparing Preact.js and Vue.js, you can also consider the following products
Deku - Functional view library for building UI components as an alternative to React
AngularJS - AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.