LTspice IV is a powerful SPICE simulator, schematic capture and waveform viewer with features and models to make simulating switching regulators faster. The free version includes a full working LTspice IV, Linear Technology macro models, more than 200 op amp models, resistor models, transistor models, and MOSFET models.
Wineskin Winery creates Mac OS X ports/wrappers for Windows programs/games, with an easy-to-use GUI, integrated Wine, X11 and an installer.
LiquidMac uses a particle system to imitate liquid and responds to laptop orientation.
