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

FIRST hit on Google (java open source laf):

http://javabyexample.wisdomplug.com/java-concepts/37-core-java/65-20-free-look-and-feel-libraries-for-java-swings.html

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

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

Answer 2

Substance LAF from Kirill Grouchnikov is the best I know.