We review efficient Monte Carlo methods for simulating quantum systems which
couple to a dissipative environment. A brief introduction of the
Caldeira-Leggett model and the Monte Carlo method will be followed by a
detailed discussion of cluster algorithms and the treatment of long-range
interactions. Dissipative quantum spins and resistively shunted Josephson
junctions will be considered.Comment: to be publushed in Proceedings of the Yukawa Symposium 200