Clerk is authentication and user management with prebuilt components for React and Next.js.. The tools below share its categories (APIs, Security). Most are still pre-launch, so you are comparing direction and early access rather than finished feature lists.
Drop
LaunchedA rootless Linux sandbox for isolating coding agents and third-party programs.
Inngest
LaunchedDurable workflows and background functions triggered by events, written in your own codebase.
Resend
LaunchedAn email API for developers, with React Email templates and deliverability tooling.
Sanity
LaunchedA content platform with a real-time content backend and an open-source, customisable studio.
Sesame
BetaAn open-source password manager that works without an account, with your vault as a local file.
Stripe
LaunchedPayments infrastructure and APIs for charging cards, running subscriptions and moving money online.
Upstash
LaunchedServerless Redis, vector search and message queues with HTTP APIs.
Zoneless
LaunchedAn open-source payments platform positioned as an alternative to Stripe Connect.
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