#1
Novu

Novu

★★★★ 4.3 Free / $0.0025+ Free plan

Open-source notification infrastructure for developers providing a unified API to manage in-app, email, SMS, push, and chat notifications with subscriber preferences.

multi-channel-notificationsnotification-centersubscriber-preferencesworkflow-editor
✓ Single API for all notification channels✓ Open-source with self-hosting option✓ Built-in notification center UI component
#2
SuperTokens

SuperTokens

★★★★ 4.3 Free / $0.02+ Free plan

Open-source authentication solution offering email/password, social login, passwordless, and multi-factor auth with self-hosting option and drop-in UI components.

email-passwordsocial-loginpasswordlessmfa
✓ Open-source with free self-hosting✓ Pre-built UI components for quick integration✓ Session management with anti-CSRF protection

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