Astro is a web framework for content-driven websites with island architecture and zero JS by default. It handles island architecture, zero js, ssg/ssr, and content collections, and it's best suited for developers wanting content-focused static sites. It has been around since 2021, giving it a 5-year head start in building out integrations and refining the product.

The core product is entirely free. Since it's open-source, you can self-host for free with no user limits. It's designed for small teams, striking a balance between simplicity and collaboration features.