Open source laf[look n feel] for java swing application

Question

Which are Open source lafs[look n feel] for java swing application?

Answer 1

Here is a great answer on another question: Java Look & Feel

Edit:
Don't forget the system look and feel:

try
{
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {}