KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
BioWin - BioWin
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
STOAT - STOAT - a dynamic sewage treatment works modelling package
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.
Aspen Plus - Maximize profits using a plant-wide simulation solution that combines unparalleled accuracy and engineering collaboration with time-saving workflows.