Free OOAD UML and related Books

1. UML Quick Reference card ( PDF Format )
2. Naked Objects : Full book by Pawson and Matthews
3. Object Oriented Systems Development  : Full HTML book.
4. Practical UML: A Hands-On Introduction for Developers : Quick one page tutorial. Good read.
5. Rational Rose Video Tutorial : Learn how to use Rational Rose to create Use case , Class, Sequence, Collaboration & Statechart diagrams.
6. UML in 7 Days: Learn UML in 7 days Flat

Links to other good books on Object Oriented Programming and Design Patterns

1. An Introduction to C++ and Object Oriented Programming, by Ian D Chivers, January 1999
2. OBJECT-ORIENTED PROGRAMMING and THE OBJECTIVE-C LANGUAGE
3. 
   Object-Oriented Software Composition (PDF)
4. Bringing Design to Software
5. Data Structures and Algorithms with Object-Oriented Design Patterns in Java
6. Data Structures and Algorithms with Object-Oriented Design Patterns in C#
7. Data Structures and Algorithms with Object-Oriented Design Patterns in C++
8. Data Access Patterns: Database Interactions in Object-Oriented Applications