Review on microwave techniques and plasma technology related with reaction engineering and possible process intensification. Microwave energy and various microwave instruments. Interaction with homo- and heterogeneous reactions, observed phenomena, design of microwave-assisted reactors. Unanswered questions and outlook. Fundamentals of reactions with plasmas. Plasma generation techniques and types of plasmas. Application to chemistry including heterogeneous catalysts. Personal perspective on applications and scale-up of plasmas.