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http://ofmsoablog.blogspot.co.uk/2012/05/oim-oam-ldap-oid-dip-ovd-oif-sso.html
http://docs.oracle.com/cd/E12839_01/oid.1111/e10036/index.htm
From Atul's onlineappsdba.com

Oracle Identity Management  is Fusion Middleware Component which covers following Identity & Access Management software including Directory Server.
1. Oracle Access Manager (OAM) : Identity and Access Management product acquired from Oblix (Oblix COREid Access & Identity) more here here 
2. Oracle Identity Manager (OIM) : User Provisioning product acquired from Thor more here
3. Oracle Role Manager (ORM) : Enterprise role management product acquired from Bridgestream more here
4. Oracle Web Services Manager (OWSM) : product to protect Web Services acquired from Oblix(Oblix COREsv) more here
5. Oracle Identity Federation (OIF): Broswer based cross domain SSO solution , combination of product acquired from Oblix(SHAREid) and Phaos
6. Oracle Enterprise Single Sign-On (eSSO) : Unified authentication and Single Sign-On to thin- and thick-client applications with no modification to existing applications. More here
7. Oracle Entitlements Server (OES) :  fine-grained authorization software acquired from BEA(Aqualogic Entitlement Server). More here
8. Oracle Adaptive Access Manager (OAAM): real-time fraud prevention and multi-factor authentication acquired from Bharosa . More here here and here
9. Oracle Platform Security Services (OPSS): Security Framework for Java applications and part of Oracle Fusion Middleware 11g. OPSS is self-contained, portable framework that runs on Oracle WebLogic Server.
10. Identity Governance Framework (IGF) : software to control how identity-related information is used, stored and propagated between applications.
11. Oracle Information Rights Management (IRM) : secures and tracks sensitive digital information everywhere it is stored and used, More here
12. Oracle Identity Analytics (OIA) : Identity Intelligence product acquired from Sun (Sun Role Manager) more here
13. Oracle Single Sign-On (OSSO) : In-house developed web single sign-on product, required by Oracle 10g/11g Portal. Oracle Access Manager’s (OAM) single sign-on solution is recommended web single sign-on product.
Directory Services
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14. Oracle Internet Directory (OID) : LDAP compliant directory server more here  and here
15. Oracle Virtual Directory (OVD): provides a single standard interface to access identity data from multiple directory servers like OID, iPlanet, Active Directory or Databases (Relational databases)
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Access Management Software
1. Oracle Access Manager (OAM)
2. Oracle Entitlement Server (OES)
3. Oracle Adaptive Access Manager (OAAM)
4. Oracle Information Rights Management (IRM)
5. Oracle identity Federation (OIF)
6. Oracle Single Sign-On (OSSO)
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Identity & Access Management Software
1. Oracle Access Manager (OAM)
2. Oracle Entitlement Server (OES)
3. Oracle Identity Manager (OIM)
4. Oracle Internet Directory (OID)
5. Oracle Virtual Directory (OVD)
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Acronyms related to Identity Management components
OIM – Oracle Identity Manager
ORM – Oracle Role Manager
OAM – Oracle Access Manager
OWSM – Oracle Web Services Manager
OIF – Oracle Identity Federation
eSSO – enterprise Single Sign-On
OES – Oracle Entitlement Server
OAAM – Oracle Adaptive Access Manager
ODS – Oracle Directory Services
OPSS – Oracle Platform Security Services
IGF – Identity Governance Framework
IRM – Information Rights Management
GRC – Governance Rick and Compliance platform
OID – Oracle Internet Directory
OVD – Oracle Virtual Directory
XACML – Extensible Access Control Markup Language
AAPML – Attribute Authority Policy Markup Language
SOAP – Simple Object Access Protocol
WSDL – Web Services Description Language
CARML – Client Attribute Markup Language
CSF – Credential Store Framework
OSDT – Oracle Security Developer Tools
JPS – Java Platform Security
SSPI – Security Services Provider Interface
JAZN – Java AuthoriZatioN
RBAC – Role Based Access Control
JACC – Java Authorization Contract for Containers
JAAS – Java Authentication and Authorization Service
OPSS – Oracle Platform Security Services
EUS – Enterprise User Security
DIP – Directory Integration Platform
LDAP – Lightweight Directory Access Protocol
SAML – Security Assertion Markup Language
ASA – Adaptive Strong Authentication
ARM – Adaptive Risk Management
SPML – Service Provisioning Markup Language
PSO – Provisioning Services Object