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OpenLDAP Software is an open source implementation of the Lightweight Directory Access Protocol.The suite includes:slapd - stand-alone LDAP daemon (server)libraries implementing the LDAP protocol, andutilities, tools, and sample clients.Also available from the OpenLDAP Project:Fortress - Role-based identity access management Java SDKJLDAP - LDAP Class Libraries for JavaJDBC-LDAP - Java JDBC - LDAP Bridge Driver

Active Directory (AD) is a directory service that Microsoft developed for Windows domain networks and included in most Windows Server operating systems as a set of processes and services.

OneLogin is a cloud-based IAM solution providing users secure access to cloud applications from any device.

Provide secure identity management and single sign-on to any application, whether in the cloud, on-premises or on a mobile device for your employees, partners and customers with Okta.

Azure Active Directory is a comprehensive identity and access management cloud solution that provides a robust set of capabilities to manage users and groups.

Bitium is a provider of cloud-based identity and access management solutions, including single sign-on, password management, and analytics for small, medium and enterprise businesses. Founded in 2012, the company aims to give growing companies the ability to manage access to all of their web-based applications -- including Google Apps and Office 365, as well as social networks and CRM, collaboration and marketing tools -- in one place without hindering employee adoption of these applications. Organizations such as GroupM, Fullscreen, Movember and Demand Media use Bitium for an easy-to-use solution that delivers increased flexibility and security. To learn more about Bitium, please visit www.bitium.com . »

Centrify provides Unified Identity Services across data center, cloud and mobile — resulting in one single login for users and one unified identity infrastructure for IT. Centrify's software and cloud services let organizations securely leverage their existing identity infrastructure to centrally manage authentication, access control, privilege management, policy enforcement and compliance across on-premise and cloud resources. More than 5,000 customers have deployed Centrify across millions of servers, workstations, and applications. With Centrify, organizations are reducing their costs associated with identity lifecycle management and compliance by over 50%. »