As a leading cause of adult disability, stroke is also the number three cause of death behind diseases of the heart and cancer, and strokes kill over 157,000 Americans a year. About five million Americans are living with the effects of stroke and Americans spent about $58 billion in 2005 for stroke-related medical costs and disability. Traditional treatment (e.g. physical therapy) is laborious and costly. More recently, tremendous efforts have been put into developing rehabilitation and assistive robots to facilitate the rehabilitation training while relieving the physical involvement of therapists and/or lowering the related cost. Most notably, the rehabilitation and assistive robots have been significantly advanced with developments in actuators, sensors, micro-processors, and mobile software platforms. In this talk, computer-controlled motorized devices are reviewed according to their target body part (e.g. lower extremity), control theme and design etc. Finally, the speaker will highlight a study in which a motorized ankle device was developed and used to assess and treat ankle in stroke survivors.