In this review, we indicate with the adjective unbiased those rare event sampling methods that are not based on the perturbation of a system's Hamiltonian by introducing any biasing potential or any artificial force, yet achieve an enhancement of the sampling of activated events by efficiently sampling trajectories obtained using standard MD. Such techniques are based on efficiently sampling the Transition Path Ensemble (TPE) and have been spearheaded by Transition Path Sampling (TPS). After briefly introducing TPS, hereafter, we focus on reporting only techniques that have recently been used to model nucleation from multicomponent liquids, such as Transition Interface Sampling and Forward Flux Sampling that has recently been used to simulate NaCl nucleation from aqueous solution at moderate supersaturations (see .