MakerKit is a comprehensive SaaS starter kit that enables developers to quickly build and launch SaaS applications using Next.js and Remix. It offers pre-built features like full authentication flows (password, magic link, social login), multi-factor authentication with Firebase or Supabase, and billing and subscription management through Stripe or Lemon Squeezy, complete with a customer portal. MakerKit supports multi-tenancy, includes a super admin panel for user management, and utilizes Shadcn UI with Tailwind CSS for customizable components in both dark and light themes. Additional features include a blog, documentation/help center, mobile-friendly design, a fully serverless stack with high-quality, strictly typed code and end-to-end testing using Playwright. It also provides customizable emails with React.Email, easy integration with email marketing services, and various plugins like AI chatbot, waitlist, testimonials, roadmap, and analytics. With extensive documentation, a CLI for project automation, translation support, daily updates, and a supportive community on Discord, MakerKit aims to help developers efficiently build their SaaS projects with a long-term vision.