ANTARES is currently the largest neutrino telescope operating in the Northern Hemisphere, aiming at the detection of high energy neutrinos from astrophysical sources. Such observations would provide important clues about the processes at work in those sources, and possibly help solve the mystery of high energy cosmic rays. In this context, ANTARES has developed several multimessenger programs based on time and/or space coincidences with other cosmic probes such as photons, cosmic rays and gravitational waves. In this contribution, searches for neutrinos in correlation with blazars and microquasars, and TAToO, the follow-up program of ANTARES, are described.