Pmx Editor - PMX Editor is for editing 3D model data to be used in MikuMiku Dance.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
3DTin - 3DTin is a browser based 3D modelling tool.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
DeleD CE - DeleD is a 3D modeler and level-editor combined into one.
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.