COMSOL Multiphysics is a cross-platform finite element analysis, solver and multiphysics simulation software. OptaPlanner is an Open Source Constraint Solver written in Java. Today, nearly every finite element solver available is based on the direct stiffness method. Jostle is a sequential and parallel graph partitioning solver developed by Chris Walshaw. That is, they are possible to describe and solve via a SAT solver. Other PLCs used a form of instruction list programming, based on a stack-based logic solver. Treengeling is an example for a parallel solver that applies the Cube-and-Conquer paradigm. Hamiltonian paths and cycles can be found using a SAT solver. It has an exceptionally simple implementation for a full wave solver. Marx argued that the state cannot be a neutral problem solver. HordeSat is a parallel portfolio solver for large clusters of computing nodes. A modern Parallel SAT solver is ManySAT. Clues given to the solver are based on various forms of wordplay. A first-order method is implemented in the Splitting Cone Solver (SCS) . It uses differently configured instances of the same sequential solver at its core.