This paper reviews the major detector concepts being developed for the future Electron-Ion Collider (EIC). After a brief introduction into the EIC, some of the choices and options for a detector for the EIC are reviewed, followed by a discussion of the four major concepts to date: BEAST, JLEIC, ePHENIX, and TOPSiDE. Particular emphasis is given to novel technologies, such as imaging calorimetry, precision timing silicon sensors, and streaming readout.