Numerous processes in physical chemistry and related sciences take place in cycle, with consecutive alternations in time. Widely known as oscillatory or oscillating reactions, such processes are explored as nonlinear phenomena, but their potential in various applications became recognized only recently, almost 100 years after the discovery of the first homogeneous oscillatory reaction. This lecture will discuss the results of contemporary research focused on the application of oscillatory reactions in the design of new materials, devices and technologies. Wide spectrum of analytical applications of oscillatory reactions was developed, with unexpected robustness and high sensitivity toward evaluation of pharmaceutically active compounds. Self-oscillating gels were developed to be used as components of micro devices (actuators) or to achieve controlled periodic drug delivery. Oscillatory reactions are also central figure in attempts to develop chemical computing systems as devices for fast parallel information processing. Advantages of fuel cells with electro-catalytic oxidations in oscillating regime were reported, too. There are also examples of other catalytic systems where oscillating dynamic state was found advantageous over the monotonous catalysis in stable steady state. Most examined oscillatory catalytic system may be oxidation of CO over Pt, but carbonylation of alkyne over Pd complexes is the first catalytic system where selectivity improvement was reported under oscillatory regime.