From Hack/Mine Wiki
There are currently three default classes in Hack/Mine: the Warrior , the Mage , and the Ranger. The Hack/Mine Team plans on adding additional classes to the default set, specifically a Bard and a healing class of some sort. Subclasses are also a distinct possibility.
As of 0.6.4.1, classes may be completely customized via /spells/hsmConfig.JSON.