Mithril is around 12kb gzipped thanks to its small, focused, API. It provides a templating engine with a virtual DOM diff implementation for performant rendering, utilities for high-level modelling via functional composition, as well as support for routing and componentization.
Mithril is an open source tool with 11.1K Github Stars and 835 Github Forks. Here’s a link to Mithril's open source repository on Github
5 companies use Mithril including Dial Once, Cloud Vlts, Inc., and SpartanGeek.