The best one for web apps (not landing pages) is Achromatic. Website: https://achromatic.dev https://achromatic.dev "Acme" demo: https://demo.achromatic.dev

The best one for web apps (not landing pages) is Achromatic. Website: https://achromatic.dev https://achromatic.dev "Acme" demo: https://demo.achromatic.dev/ https://demo.achromatic.dev/ Packed with essential features (~40k SLOC) and updated frequently with a focus on quality over quantity. It's built with Next.js 15, React 19, Auth.js 5 and shadcn/ui - fully embracing RSC and server actions. Besides that I'm adding regularly important application components like TreeView, ColorPicker or RichTextEditor: https://achromatic.dev/docs/components https://achromatic.dev/docs/components It's fairly new, I've launched it less than 3 weeks ago, but already got over 40 customers in that short amount of time. I run a SaaS myself and took quite a lot of components from there and also help customers/partners getting their SaaS started via Google Meet. Also there are 4 freelancers in the US, Germany, India and France who use the boilerplate for their client projects. The license is very business-friendly and allows unlimited developers and projects.