SQL Developer and the User-Related Information Location

Sql Developer generates a lot of data stored by default in home directory. Usually it is not a problem, but if you have a quota on your directory, well... Fortunatelly there is a way to change the location of user related data: http://docs.oracle.com/cd/E18464_01/doc.30/e17472/intro.htm#CIHFCGCD
The only thing that must be done is to define IDE_USER_DIR environment variable.
But!
Before doing that you should copy already existing data to new directory, or at least export your connections :)