Ferrum VS zitadel

Personally, I like KeyCloak and use it where it is possible. About 2 years ago I had to expand my technology stack and I started to write apps using Golang. These apps are WEB API that use Authorization on KeyCloak server. When API grows and become more complicated, it is very important to make automated integration tests. For authorization we using separate from demo/production server, and it is important to make code portable to any machine, therefore the most convenient way is to start all infrastructure before any test and stop when test ends with any persistent data cleanup at the end. Such approach can't be easily and fast implemented using Keycloak. Therefore, we created Ferrum authorization server that could be run and stopped from code and with API compatible with KeyCloak (with similar behavior and endpoints). Ferrum could be used not only for tests purposes but also like a full-fledged authorization server.

Im one of the authors of ZITADEL the open source identity and access management solution.

An other Keycloak alternative would be our (I am one of the founders) project ZITADEL.

You could take a look at https://zitadel.ch/ Or curity https://curity.io/product/

I'm biased since I work for ZITADEL (https://github.com/caos/zitadel). Passwordless with FIDO2 has been baked in since the beginning. I reckon that the major Open Source alternatives provide support as well. FIDO2 should work on all major OS and browsers.

And a bigger project i know is zitadel (https://github.com/caos/zitadel)

https://zitadel.ch/ https://github.com/caos/zitadel/

Full disclosure: My company is building ZITADEL, an open source alternative for Auth0 or Keycloak (both still very good, with some drawbacks). https://github.com/caos/zitadel/

We are building a cloud-native IAM over here https://github.com/caos/zitadel

It is written in Go and built around event sourcing for a great audit trail. We already support OIDC, Passwordless, RBAC and working on more features each day.

For those who want to run it on-prem we have a kubernetes operator ready in the next few weeks who also manages the database (cockroach).

We run our own service here https://zitadel.ch with a free tier as well

Feel free to engage with us on GitHub discussions.

I'm not sure if it makes sense to build your own oauth/oidc server. It's fun to learn all these techniques but you have to maintain much more code. You also have to implement security mechanisms from dev and ops perspectives. There are existing implementations. If you want to check out an existing open source implementation in go you could take a look at the implementaion of my company called zitadel. I would love to answer question if there are any.