Advances in the development of technologies significantly impacted the assessment and rehabilitation and improved motivation and participation, particularly in children, thus permitting the delivery of intensive, personalized, and goal-oriented training. In the plethora of available technological solutions for subjects in developmental age, different classifications can be proposed, and the perspective of this chapter considers the main aim of the technologies, that is, the primary function for which they were designed and built. The focus is on technological devices specifically conceived and developed for clinical purposes—such as motor assessment, rehabilitation, and assistance. With the aim of ensuring a focus on clinically validated and purpose-built systems, we focus on devices inherently designed ad hoc to meet clinical and rehabilitative needs, excluding products available for other uses (due to the frequent lack of methodological rigor, clinical validation, and regulatory oversight required in healthcare). In fact, clinical technologies emerge from close collaboration between engineers, clinicians, and researchers, and are designed to ensure safety, reliability, and therapeutic efficacy. In this sense, technologies will be presented grouped as follows: (i) for evaluation of motor performance; (ii) for assisting, supporting, and compensating the motor impairment; (iii) for the rehabilitative motor treatment; (iv) for home-based motor intervention by means of tele-rehabilitation systems and/or the monitoring of everyday life functioning. This chapter provides an overview of the current technologies available in developmental age, with respect to children with Cerebral Palsy (CP), highlighting their applications and potentialities for improving assessment, treatment, and motor rehabilitation outcomes.