SPA JS is built on the popular paradigm “KISS” (Keep It Simple, Stupid) that emphasizes on keeping a framework simple and not complicating it. Ideally a powerful framework should do all the heavy lifting and must make it easy for the developers to focus on the product features and not the framework.

Single-spa is a javascript framework for front-end microservices. Use multiple frameworks in a single-page application, allowing you to split code by functionality and have Angular, React, Vue.js, etc. apps all living in harmony.

Mithril.js is a modern client-side JavaScript framework for building Single Page Applications. It's small (8.8 KiB gzip), fast and provides routing and XHR utilities out of the box.