  We review recent theoretical work on thermoelectric energy harvesting in
multi-terminal quantum-dot setups. We first discuss several examples of
nanoscale heat engines based on Coulomb-coupled conductors. In particular, we
focus on quantum dots in the Coulomb-blockade regime, chaotic cavities and
resonant tunneling through quantum dots and wells. We then turn towards
quantum-dot heat engines that are driven by bosonic degrees of freedom such as
phonons, magnons and microwave photons. These systems provide interesting
connections to spin caloritronics and circuit quantum electrodynamics.
