One thing to keep in mind is that Gluu is an IAM platform, not just an OpenID Connect Provider. It's a comprehensive suite that includes both central authentication, authorization, FIDO authentication (and support for many two factor technologies), mobile software, client software. Starting in version 3.0, we will bundle a special version of OpenLDAP, provided by Symas (another great FOSS vendor), specifically optimized for the Gluu Server.

An IAM platform is many products integrated together, and operationally scalable to meet mission critical requirements. An OpenID Provider is just one element of an IAM platform!