Remix is the only real alternative I've heard about that isn't itself Next-based.

We migrated to Remix a few months ago, never going back.

If you're down with the paradigm of Next.js App Router, Remix is just a strictly better version.

If you're not you stick with pages router and get ready to fork as soon as they drop it. (Just don't ask when that will be https://www.reddit.com/r/reactjs/comments/156m504/comment/jt...)

Remix is like the Next.js Pages Router + a helper similar to Server Actions. It does not support Server Components (what the App Router uses) and they're exploring using RSC in the future. So definitely different.

For example, `getServerSideProps` in Next.js is the same as a `loader` in Remix.

Astro probably, if they want to keep using React components.

Otherwise they might also be looking at Nuxt, Sveltekit or Solidstart, but if they're switching top-level frameworks they may as well use Astro because they can mix and match React/Vue/Svelte/Solid