  The state of the art in the study of pionic, kaonic and Sigmionic atoms,
along with the in-medium nuclear interactions deduced for these hadrons, is
reviewed. A special emphasis is placed on recent developments in
antikaon-nuclear physics, where a strongly attractive density dependent
antikaon-nuclear potential of order 150-200 MeV in nuclear matter emerges by
fitting K^- atom data. This has interesting repercussions on antikaon
quasibound nuclear states, on the composition of strange hadronic matter and on
kaon condensation in self bound hadronic systems.
