This is a special folder where configurations can be found.
Under Linux this folder can be found in the home folder of the user starting Odysseus and is named .odysseus.
Under Windows this folder can be found under \Users\<USER>\odysseus (in most cases this should be c:\Users\...)
You can change the ODYSSEUS_HOME folder by setting it as an environment variabale. This can e.g. be done with a start parameter -DODYSSEUS_HOME=