| AdaptiveEulerSolver | Adaptive Euler solver |
| Body | Interface for bodies |
| ChargedParticle | ChargedParticle with mass and charge |
| Constants | Common physical constants |
| CoulombForce | Coulomb electrostatic force |
| EulerSolver | Non-adaptive Euler solver |
| Factory | List of MetaObject |
| Force | Interface for forces |
| GenericEulerSolver | Adaptive and non-adaptive Euler solver with error estimation |
| GravitationForce | Newton gravitational force |
| GslAdaptiveSolver | Adaptive solvers from GSL library |
| GslGenericSolver | Adaprive and non-adaptive solvers from GSL library |
| GslSolver | Non-adaptive solvers from GSL library |
| Item | The root class for any world items (bodies and forces) |
| MetaObject | Meta-information about class |
| MetaProperty | Meta-information about property |
| Object | Root of the StepCore classes hierarchy |
| PairForce | Helper class for forces that act between two selected bodies |
| Particle | Particle with mass |
| Polygon | Rigid polygon |
| RigidBody | Rigid body |
| Solver | Generic Solver interface |
| Spring | Massless spring |
| Vector | Fixed-length vector |
| WeightForce | Weight force (constant gravitational force) |
| World | Contains multiple Item, Solver and general properties such as time |
| XmlFile | Class for saving and loading World as XML file |
1.5.1