Here's a curated list of awesome light weight & modern JS frameworks that can be loaded through a CDN.

HTMX

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• CDN : https://unpkg.com/browse/htmx.org/dist/
• Access AJAX, CSS Transitions, WebSockets and Server Sent Events directly in HTML, using attributes.

Alpine

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• CDN : https://cdn.jsdelivr.net/npm/alpinejs/dist/cdn.min.js
• A rugged, minimal framework for composing JavaScript behavior in your markup.

Van

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• 
• CDN : https://cdn.jsdelivr.net/gh/vanjs-org/van/public/van-latest.min.js
• Ultra-lightweight, zero-dependency, and unopinionated Reactive UI framework, feels like building React apps, without JSX.

Preact

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• 
• CDN : https://unpkg.com/preact/dist/preact.js
• Fast 3kB(not anymore) alternative to React with the same modern API.

Inferno

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• CDN : https://cdn.jsdelivr.net/npm/inferno/dist/inferno.min.js
• An extremely fast, React-like JavaScript library for building modern user interfaces.

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Mithril was removed from the list due to no visible development in a year even though a major release was announced 2 years ago