A review with 64 refs. covering metathesis-based com. processes for making detergents, pesticides, fragrants, and specialty polymers, olefin, alkyne and enyne metatheses, Grubbs and Schrock catalysts and their com. applns.; stereo and regioselective reactions like cross metathesis of alkenes, ring-closing and ring-opening metatheses of resp. dienes and cycloalkenes illustrative of rapid transfer of research results into com. sustainable processes for making fine chemicals; and Author's achievements in metathesis of Si compds.