SPOT (Systems Polynomial Optimization Tools) is a MATLAB toolbox written as an alternative implementation of SOSTools to be used in implementing a class of nonlinear system identification algorithms. It was tested with MATLAB 7.8.0 (R2009a). SPOT provides its own matrix multivariable polynomial variable class msspoly for handling elementary polynomial operations, a special class mssprog for defining convex optimization problems (to be solved by SeDuMi) in terms of polynomial identities and self-dual cones, and a set of functions for identification of linear and nonlinear dynamical systems.