You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
Easy integration with OAuth 2.0 service providers.
thephpleagueWordPress plugin to provide an OpenID Connect Generic client
oidc-wpFusionDirectory is a modern, efficient and secure Identity Management (IAM) solution.
fusiondirectory[Laravel 5.4+] An integration to add SSO to your service via SAML2 protocol based on OneLogin toolkit with support of multiple Identity Providers
24Slides