Features:
* Classical mechanical simulation in two dimensions
* Particles, springs with damping, gravitational and coulomb forces
* Rigid bodies
* Collision detection (currently only discrete) and handling
* Soft (deformable) bodies simulated as user-editable particles-springs system, sound waves
* Molecular dynamics (currently using Lennard-Jones potential): gas and liquid, condensation and evaporation, calculation of macroscopic quantities and their variances
* Units conversion and expression calculation: you can enter something like "(2 days + 3 hours) * 80 km/h" and it will be accepted as distance value (requires libqalculate)
* Errors calculation and propagation: you can enter values like "1.3 ± 0.2" for any property and errors for all dependent properties will be calculated using statistical formulas
* Solver error estimation: errors introduced by the solver is calculated and added to user-entered errors
* Several different solvers: up to 8th order, explicit and implicit, with or without adaptive timestep (most of the solvers require GSL library)
* Controller tool to easily control properties during simulation (even with custom keyboard shortcuts)
* Tools to visualize results: graph, meter, tracer
* Context information for all objects, integrated wikipedia browser
* Collection of example experiments, more can be downloaded with KNewStuff
* Integrated tutorials.