Hopsan

Hopsan is a modelling and simulation environment for fluid power and mechatronic systems. It is used to assemble components such as pumps, cylinders, valves, and lines together with mechanical and control elements, then run time-domain simulations of how the assembled system behaves. This makes it applicable to hydraulic and pneumatic circuit studies, drivetrain work, and mixed domains where fluid, mechanical, and signal components interact in one model.

The project is developed by Robert Braun and Peter Nordin and distributed under a combination of Apache-2.0 and GPL-3.0 terms, reflecting different licensing for separate parts of the codebase. Users redistributing or embedding portions of it should check which terms apply to the component they are working with.

Packaging here targets Linux, so it fits engineering workstations running that platform. Tools of this type generally reward familiarity with the underlying physical equations: building a useful model means understanding the component parameters being entered, and simulation output reflects the assumptions in the model rather than a measured system.