#1Tools for testing and implementing authentication mechanisms (e.g., MFA, SSO) and authorization policies.
Kitploit recommended

The Secure CommsOS™ for mission-critical operations
Open Source Identity and Access Management For Modern Applications and Services

Free universal database tool and SQL client

A tool for secrets management, encryption as a service, and privileged access management

JumpServer is an open-source Privileged Access Management (PAM) platform that provides DevOps and IT teams with on-demand and secure access to SSH,…

The Symfony PHP framework

Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any…

An open source, self-hosted implementation of the Tailscale control server

Checklist of the most important security countermeasures when designing, testing, and releasing your API

Infisical is the open-source platform for secrets, certificates, and privileged access management.

The easiest, and most secure way to access and protect all of your infrastructure.

The most comprehensive authentication framework

The Single Sign-On Multi-Factor portal for web apps. OpenID Certified™ and Post-Quantum Cryptography Ready.

Provides open-source SSO and identity provider functionality with SAML, OAuth2/OIDC, LDAP, and RADIUS support for centralized authentication,…

FreeRDP is a free remote desktop protocol library and clients

Secure tunneling daemon implementing VPN protocols with TLS encryption, certificate authentication, and routing/firewall configuration for private…

Authorization library enforcing ACL, RBAC, ABAC, and custom access-control models with RESTful matching and policy management APIs for applications…

A lightweight, cryptography-powered, open-source toolkit built to enforce Zero Trust security for infrastructure, applications, and data in the…