The superconducting Kinetic Inductance Detectors (KID) that we develop at the Institut Néel since 2009 have emerged as the best choice to build very sensitive cameras exploring the cold Universe, accessible via observations at millimetre wavelengths. Among our targets, in decreasing order of distance, the Cosmic Microwave Background (first light), primordial galaxies, clusters of galaxies, near-by galaxies, interstellar dust, proto-planets and Solar System objects. I will describe the technology developed in Grenoble and show some results of observations from the 30-meters telescope in Sierra Nevada, APEX telescope in Chile and preliminary tests on the Nobeyama 45-meters antenna in Japan. I will also describe other applications in particle and astroparticle like for example the search of dark matter.