Flamingo Raises $4.5M to Get MSPs Out of the Ticket Queue

Skip to content
CAS logo

CAS

Identity and Access Management (IAM)

Open Source
Free Tier
Self-hosted
OpenMSP Score
62
48
Reddit Impact Score
Github Score
807M
11KStars
3KForks
35KCommits
Apache License 2.0License
Oct 13, 2026Last commit

Alternative Vendors

Keycloak
Keycloak
Authentik
Authentik
Teleport
Teleport
JumpServer
JumpServer

Commercial Alternatives

Okta
Okta
Azure Active Directory
Azure Active Directory
Huntress
Huntress
Duo Security
Duo Security
CAS (Central Authentication Service) is an open-source single sign-on protocol for web applications. It provides centralized authentication and authorization services with support for various authentication methods and integration with existing identity systems.
image media

Key Features

Enterprise Single Sign-On Protocol

Implements CAS v1, v2, v3, SAML v1/v2, OAuth v2, OpenID Connect, and WS-Federation protocols for comprehensive SSO support across multiple applications and platforms

Multi-Authentication Support

Supports authentication via JAAS, LDAP, RDBMS, X.509, RADIUS, SPNEGO, JWT, MongoDB, Apache Cassandra, and social providers like WS-FED, SAML2, OpenID Connect

High Availability Clustering

Built-in support for HA clustered deployments using Hazelcast, JPA, Memcached, Apache Ignite, MongoDB, Redis, and DynamoDB for enterprise-scale reliability

Multi-Factor Authentication

Comprehensive MFA support including Duo Security, YubiKey, RSA, Google Authenticator (TOTP), WebAuthn FIDO2, and other modern authentication methods

Pros and Cons

Pros

Open Source and Free

100% free open source software licensed under Apache v2, managed by Apereo Foundation with no licensing costs

Extensive Protocol Support

Supports virtually all modern authentication protocols including SAML, OAuth, OpenID Connect, and legacy systems

Enterprise-Grade Scalability

Proven to scale from small deployments to Fortune 500 companies with clustering and high availability features

Cons

Complex Configuration

Requires significant technical expertise to configure and deploy properly, especially for advanced features

Limited Commercial Support

Relies primarily on community support; commercial support options are limited compared to proprietary solutions

Feature Comparison

Comments

No reviews yet. Be the first to share your experience with CAS.

Frequently Asked Questions

vendor

Getting Started

OpenMSP is The MSP Knowledge Hub & Community Platform designed specifically for Managed Service Providers seeking to optimize their technology stack, reduce vendor costs, and discover open-source alternatives. We combine a comprehensive vendor directory, open-source solution catalog, and integrated community discussions to help MSPs make informed decisions.
Yes, completely free. Browse vendors and tools, read comparisons, and join community discussions - no cost, no registration required. OpenMSP is community-supported and focused on empowering MSPs to reduce costs and improve operational efficiency through open-source technology.
We help MSPs identify cost-effective alternatives to expensive commercial solutions, provide transparent vendor information, and connect you with proven open-source alternatives. Our platform enables MSPs to make informed decisions about their technology investments.
No account required for browsing vendors, reading comparisons, or accessing community content. Creating a free account with SSO (Microsoft, Google, or Slack) allows you to participate in discussions and save your favorite tools.

Platform Information

OpenMSP is currently community-supported. We focus on providing value to the MSP community first. Any future monetization will keep the core platform free for MSPs while maintaining our independence and commitment to unbiased information.
We focus exclusively on MSP needs with transparent vendor information and open-source alternatives. No vendor partnerships or sponsored listings - just honest, community-driven information to help MSPs make better technology decisions. Our biggest value is our community where MSPs help each other with questions, setup guidance, and sharing real-world experiences.
Our community of MSP professionals helps verify and update information. We also maintain direct research on tools and vendors to ensure accuracy. Community members can report outdated information, and we work to keep everything current.
OpenMSP was founded by Michael Assraf, who has extensive experience in the MSP industry and product leadership. As the former CEO & Founder of Vicarius, Michael grew a startup from $0 to $9M ARR with 500+ customers and deep experience working with MSPs, partners, and fundraising. OpenMSP represents his commitment to empowering the MSP community through better technology decisions and cost optimization.

Open-Source Tools & Alternatives

We assess tools based on active development, community size, documentation quality, production deployments by MSPs, and available support options. Tools must meet strict criteria for reliability and enterprise readiness.
Many open-source projects offer multiple support options including community forums, commercial support from vendors, professional services, and our community discussions where experienced MSPs share implementation guidance.