Look and Feel
A Look and Feel changes the complete visual presentation of an application, the.. uhmm. look and feel so to speak. Selecting one of the look and feels applies it directly
System Default
This is this the Look and Feel delivered with Java designed for the platform you are running on
Data Crow Classic
Applies the Tonic Look and Feel which was has been the only and default look and feel for Data Crow for ages
System Look and Feels
All the Look and Feels provided by Java, tailored for specific platforms
Skin Look and Feels
Skins provided by the Skin Look and Feel project, found here