Best 20+ Tools for Backend Software Engineers in 2025

Better Auth is a framework-agnostic authentication library that runs directly in your application. It handles user accounts, login sessions, and security features without relying on external services. You keep full control of your user data because everything runs on your own database and server.

Auth.js is a complete authentication solution that works across different JavaScript frameworks. It provides everything needed to add secure login systems to websites and applications. You can let users sign in through their existing accounts on services like Google or GitHub, or you can use email-based magic links, or even traditional username and password combinations.

Casdoor is a complete identity management solution that handles user authentication and authorization for your applications. It supports OAuth 2.0, OpenID Connect, SAML, CAS, and LDAP protocols, making it compatible with almost any application or service.

Tesseral is a complete authentication system designed for business-to-business software applications. It handles user login, permission management, and security features so developers can focus on building their main product.

Authorizer is a tool that adds login and user management to your website or app. You connect it to your existing database, and it creates a complete system for users to sign up, log in, and manage their accounts. Unlike paid services, you own all the code and data.

Stytch is an authentication service that helps developers add login and security features to their websites and mobile apps. Instead of building authentication from scratch, developers can use Stytch's ready-made tools and code libraries to quickly set up secure user login.

Stack Auth is a complete authentication solution that handles all the complex parts of user login and management. When you add it to your application, you get ready-made login pages, account settings, password reset flows, and user dashboards without writing code for these features yourself.

SuperTokens is an authentication framework that handles user login, registration, and session management for your applications. It provides ready-made solutions for email password login, social login through providers like Google and Facebook, passwordless authentication using magic links or one-time codes, and more.

MojoAuth is a tool that lets users log into apps and websites without typing passwords. It offers several ways to verify who you are, such as sending a special link to your email, texting a code to your phone, or using your fingerprint or face scan.

Magic is a software development kit that helps developers add secure login systems to their applications. When a user wants to log in, they receive a one-time code via email or SMS instead of typing a password. This makes the login process faster and more secure.