FusionAuth
FusionAuth is the authentication and authorization platform engineered for developers who demand flexibility and control. Built from the ground up to integrate with any stack, every feature — from user registration to MFA and SSO — is exposed via a modern, well-documented API.
Support for every major identity protocol is included out of the box: OIDC, SAML, OAuth2, JWT, passwordless login, social sign-on, and more. Whether you’re building a greenfield app or retrofitting auth into a legacy system, FusionAuth adapts to your use case — not the other way around.
Need compliance? FusionAuth helps you meet GDPR, HIPAA, and COPPA standards quickly and reliably.
Deploy it your way: install on Linux, Windows, macOS, Docker, or Kubernetes — or go with FusionAuth Cloud, our managed SaaS hosting. No black boxes. No vendor lock-in. Just powerful, customizable auth that works the way you do.
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Auth0
Auth0 takes a modern approach to Identity and enables organizations to provide secure access to any application, for any user. Auth0 is highly customizable, and simple yet flexible. Safeguarding billions of login transactions each month, Auth0 delivers convenience, privacy, and security so customers can focus on innovation.
With Auth0, you can rapidly integrate authentication and authorization for web, mobile, and legacy applications, with new Fine Grained Authorization (FGA) that goes beyond role-based access control.
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Supalaunch
SupaLaunch serves as an all-in-one SaaS boilerplate developed using Next.js and Supabase, aimed at expediting the creation of full-stack web applications. It encompasses crucial functionalities such as user authentication (featuring both email and Google login options), a PostgreSQL database, image storage capabilities, API integrations, and support for Stripe payments, which accommodate both one-time transactions and subscription services. The platform also provides a ready-made landing page designed with Tailwind CSS and DaisyUI, which includes customizable elements such as a navigation bar, partner logos, product features, pricing details, FAQs, and footer sections. Additionally, SupaLaunch incorporates a markdown-based blog that enhances SEO-friendly content management, integrates AI capabilities through OpenAI API, and supports streaming functionalities, all while offering over 20 distinct UI themes. Other notable features include predefined SEO tags, an automatically generated sitemap to enhance discoverability, comprehensive website analytics, and the ability to send programmatic emails via MailerSend. The architecture of the boilerplate is intentionally structured to enable swift project initiation, making it an ideal choice for developers looking to streamline their workflow. With its diverse features, SupaLaunch not only simplifies the development process but also enhances the overall user experience.
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Just Ship
Just Ship is a completely free and open-source SaaS starter kit crafted with Svelte 5 and SvelteKit, aimed at streamlining web application development by offering a range of essential functionalities right from the start. It features user authentication through magic links and Google social login, while user information is securely stored in a Turso database. The kit comes with more than 30 pre-designed styles powered by daisyUI, ensuring support for dark mode and providing various landing page components to enhance quick UI development. Integrated payment processing via Stripe allows for effortless payment acceptance and webhook management. Analytics are effectively handled through PostHog, which includes configurations that circumvent ad blockers by using Vercel as a proxy, alongside support for A/B testing and feature flags to optimize user engagement. Moreover, it simplifies SEO tag management through the load function and enables email communications via Postmark, with deployment made easy through Vercel, ensuring a comprehensive toolkit for developers looking to launch their applications efficiently. This all-in-one solution not only accelerates the development process but also empowers developers with the tools they need to create robust web experiences.
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