JAVA...
The
NetBeans IDE Field Guide 
The Field Guide provides both
an introduction to the IDE and a task reference (think
in terms of a "cookbook") for intermediate
to advanced users.
Java
Look and Feel Design Guidelines, second edition 
Java Look and Feel Design
Guidelines, second edition can be accessed online
for free. This free book divided into 4 parts: Part
I: Overview, Part II: Fundamental Java Application
Design, Part III: The Components of the Java Foundation
Classes, Part IV: Backmatter.
Java
Look and Feel Design Guidelines: Advanced Topics 
Java Look
and Feel Design Guidelines: Advanced Topics can be
accessed online for free. Chapters are Introduction,
Windows, Menus, Behavior, Idioms, Responsiveness,
Wizards, Events and Alarms.
Interface
Design Best Practices in Object-Oriented API Design
in Java
Interface Design Best Practices in Object-Oriented
API Design in Java is a free online Java book.
Inside
the Java Virtual Machine
Inside the Java Virtual Machine by Bill Venners
is not complete yet. 9 chapters are available.
Java
