  We present a self-contained formulation of spin-free nonrelativistic quantum
mechanics that makes no use of wavefunctions or complex amplitudes of any kind.
Quantum states are represented as ensembles of real-valued quantum
trajectories, obtained by extremizing an action and satisfying energy
conservation. The theory applies for arbitrary configuration spaces and system
dimensionalities. Various beneficial ramifications - theoretical,
computational, and interpretational - are discussed.
