What is Keycloak?

It is an Open Source Identity and Access Management For Modern Applications and Services. It adds authentication to applications and secure services with minimum fuss. No need to deal with storing users or authenticating users. It's all available out of the box.
Keycloak is a tool in the User Management and Authentication category of a tech stack.

Who uses Keycloak?

15 companies reportedly use Keycloak in their tech stacks, including Operon Limited, SysOps, and az project.

12 developers on StackShare have stated that they use Keycloak.

Why developers like Keycloak?

Here’s a list of reasons why companies and developers use Keycloak
Top Reasons
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Keycloak Alternatives & Comparisons

What are some alternatives to Keycloak?
A set of unified APIs and tools that instantly enables Single Sign On and user management to all your applications.
Connect all your apps in days, not months, with instant access to thousands of pre-built integrations - even add apps to the network yourself. Integrations are easy to set up, constantly monitored, proactively repaired and handle authentication and provisioning.
Devise is a flexible authentication solution for Rails based on Warden
Amazon Cognito
You can create unique identities for your users through a number of public login providers (Amazon, Facebook, and Google) and also support unauthenticated guests. You can save app data locally on users’ devices allowing your applications to work even when the devices are offline.
OmniAuth is a Ruby authentication framework aimed to abstract away the difficulties of working with various types of authentication providers. It is meant to be hooked up to just about any system, from social networks to enterprise systems to simple username and password authentication.
See all alternatives

Keycloak's Followers
6 developers follow Keycloak to keep up with related blogs and decisions.
Michael Weichselbaumer
Bruno Vicente
Gabor Buza
Yusuf Oktay