- .NET Authenticator with Single Sign-On Support — Crowd Authentication and Single Sign-On Support for .NET Clients.
- Apache Basic Authentication Module written in c
- Apache JAMES Mailet
- Application Launchpad — View and login to your Crowd enabled applications from the Application Launchpad, and change your password.
- Atlassian Crowd login screen using perl
- Crowd as an LDAP Server — A layer to turn Crowd into an LDAP server
- Crowd JAAS Login Module — The JAAS Login Module is a Crowd Application Connector for JAAS and Spring Acegi.
- Grails Integration Plugin — Plugin that adds support for Atlassian Crowd authentication and authorization to a Grails webapp.
- Integrate Crowd with PHP
- JForum Authentication Client — Plugin jar for JForum to allow authentication to occur against a crowd instance instead of JForum's own authentication.
- JForum Single Sign-On Crowd Connector — A jar to enable JForum to recognize Crowd auth token cookies and auto-login/register the user based on the data in Crowd.
- MediaWiki Integration
- Plugin Search
- RADIUS Delegated Authentication Directory — The RADIUS Delegated Authentication Directory provides a custom Crowd Directory implementation that uses a RADIUS server to process authentication.
- Ruby client & Ruby on Rails plugin — Make Crowd calls from Ruby and soon via Ruby on Rails plugin