Glimmer - Fast and light-weight UI components for the web
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Svelte - Cybernetically enhanced web apps
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.