SwitcherCAD™ III is a high performance SPICE III simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators.  Our enhancements to SPICE have made simulating switching regulators extremely fast compared to normal SPICE simulators, allowing the user to view waveforms for most switching regulators in just a few minutes. Included in this download are SPICE, macromodels for 80% of Linear Technology's switching regulators, over 200 OP-AMP models, as well as resistors, transistors and MOSFET models.

SIMetrix is a SPICE and mixed signal simulation tool for both PCB and integrated circuit design. It offers superior performance - in terms of both speed and convergence reliability - to all other products in its price bracket and possibly all PC based products generally. SIMetrix also provides extensive waveform and analysis facilities and a flexible and intuitive schematic editor, all integrated into one program.

SIMPLIS has been the leading simulation engine for power electronics simulation since 1991 when it was first introduced. Feature and performance improvements continue to strengthen SIMPLIS as the market leader today. 10 to 50 times faster than SPICE - SIMPLIS is a component level simulator like SPICE but simulates power switching circuits typically 10 to 50 times faster.

KiCAD is an open source software suite for EDA (Electronic Design Automation) - designing schematics of electronic circuits and printed circuit boards (PCB). KiCAD is developed by Jean-Pierre Charras. Compared to the others free software alternatives, KiCAD solves all stages with the same interface: Schematic Capture, PCB layout, gerber generation/visualization and library editing. KiCAD is cross-platform and runs on Linux, Windows and Mac OS X. A lot of component libraries are available. Also migrating tools for components are available (from other EDA software tools). File formats are plain text and well documented, which is good for CVS or SVN and to make automated component generation scripts. Multiple languages are supported, such as English, Portugese, Spanish, Czech., Polish, French, German, and Russian.

Wings 3D is a free and open source polygon mesh subdivision modeller inspired by Nendo and Mirai from Izware, all using the winged edge data structure. Wings 3D is available for most platforms, including Windows, Linux and Mac OS X, using the Erlang environment. Wings 3D is ideally suited for modeling and texturing low to medium density polygon meshes. It has a wide range of very effective tools optimised for these tasks hidden behind its 'minimalistic' interface. Designed as a stand-alone modeller, without animation or 'proper' rendering facilities it should not be confused with software that does include such features - although its modelling capabilities stand extremely favourable comparison with equivalent sections of such applications - whether free or commercial.