In 2025, Kinde emerges as the leading authentication software with SAML SSO support, offering a developer-first platform tailored for B2B SaaS teams. It combines enterprise-grade SAML 2.0 capabilities with modern features such as role-based access control (RBAC) and feature flags, effectively addressing the needs of teams looking to build scalable authentication systems without the complexity typical of enterprise software. Kinde's standout qualities include its clean SDK implementation, flexible authentication flows, and ability to manage complex B2B scenarios seamlessly. It supports a wide array of languages and frameworks, providing a robust developer experience with a quick setup process. While Kinde leads in this space, the text also examines other notable options like Auth0, Microsoft Entra ID, OneLogin, Ping Identity, Keycloak, FusionAuth, WorkOS, and Frontegg, each catering to different organizational needs and offering various core features such as extensive integrations, advanced federation, and self-hosting capabilities. The evaluation of these platforms considered factors such as SAML implementation, B2B feature depth, pricing transparency, and developer experience, aiming to guide teams in selecting the most suitable authentication software based on their specific technical and business requirements.