New Features Since 2.0.1
OpenMx has a number of new features available in version 2.2.x.
Perhaps most significantly, we have a new optimizer: SLSQP - An open source BFGS optimizer from the NLOPT collection. Our experience is that SLSQP performs similarly to NPSOL on unconstrained problems and outperforms it on some constrained problems. SLSQP is our new default optimizer.