KeyAuth is an open source authentication system with cloud-hosted solutions available as well.

auth-request allows you to add access control to your HTTP services based on a subrequest to a configured HAProxy backend.

KeyAuth CPP Example

The NetAuth service itself.

Implementation of DDD, CQRS and Event Sourcing

KeyAuth C++ Library 1.3 API Endpoint

Transactional email magic link and One-Time Password (OTP) authentication platform. Sign up, log in, password resets, email verification, and more.

A framework agnostic authentication library based on PSR standards

Example for a linkvertise keysystem using KeyAuth's Seller API

An ongoing & curated collection of awesome AuthN+Z software, libraries and frameworks, best guidelines and technical resources and cool stuff about Authentication & Authorization & SSO & IAM

Soul auth and identity server

Firebase authentication App with light and dark theme

PHP Example For KeyAuth Authentication System

how to use Biometric Authentication in kotlin

Beyond Campus is a full-stack alumni engagement platform designed for graduates to reconnect, network, and celebrate their shared legacy. It features an alumni directory with advanced search, event management with registration tracking, a media gallery, and secure authentication.

Facebook login app in flutter

This is an example of microservices using Python Flask

Warehouse API with microservice architecture

🔐 A django rest authentication service backend that handles storage of users account and authentication of their identities.

Custom Customer Panel - Host your authentication dashboard

Experimental and demo solution

The Application Identity service determines and verifies the identity of an app.

Fashion authentication agent: LangGraph + GPT-4o Vision + RAG. Paste an eBay link, get a confidence score.

A complete WebAuthn test platform with classic and Post-Quantum Cryptography (PQC) algorithms integrated with liboqs. Built with Python, FIDO2, and Docker, deployed with Google Cloud and Render. Built on python-fido2-PQC.

A secure Android password manager with biometric login, AES-encrypted storage, and autofill support.

XLink-Service is a minimal Node/Express REST API that finalizes Microsoft device flow, returns a complete Xbox + Minecraft token bundle, and exposes read-only endpoints for profile/titles/presence/captures/achievements/stats/inventory—secured with CORS, Helmet, rate limits, logging, and optional Swagger.

C# / CSharp API example for https://authspire.com licensing & auth system

BoronDala Auth Service

A secure and modular Flask web application featuring JWT authentication, MySQL integration, and a user-friendly calculator interface. Ideal for learning full-stack development with Python.

Azure AD based authentication micro-service written in spring boot