In this chapter we describe a real augmented environment and its associated mobile interactions based on wearable computers with appropriate interaction devices that can be either classical computer interaction devices or real objects augmented with computer interfaces called tangible objects. After presenting the main principles, we describe a concrete platform, related MDA development processes and give several applications. These examples are contextual collaborative maintenance of industrial appliances and associated just-in-time mobile learning and nutritional coaching system supporting practice and learning of management of nutritional decisions in relation to specific requirements in health or high-level sport.