LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
Mari0 - What happens when you mash Super Mario Bros. and Portal together?
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
SuperTux - SuperTux is a classic 2D jump'n run sidescroller game in a style similar to the original Super...
Pspice - OrCAD PSpice technology provides the best, high-performance circuit simulation to analyze and refine your circuits, components, and parameters before committing to layout and fabrication
Super Meat Boy - Let's start with what's the same: Dr. Fetus is still a jerk, gameplay is super challenging but fair, there are tight controls and great levels and you will die. a lot.