The "Other" ship class are for the many miscellanious ships that do not fit into the 4 other catagories. These ships generally have specialised roles they play.
The Daisy, the first ship the player has access to, is a kind of other ship.
The others and their respective nations are:
Elgava
Kalymnos
Regeinland
Escondido
Libertas
Enemonzo
Overlords
Lugovalos
Adis
Zenito
Miscellaneous