KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Microsoft 3D Builder - View, capture, personalize, and print 3D models.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Infurnia Architecture Design - Infurnia is a powerful, multi-featured cloud-native Architecture solution that you can use to introduce BIM in your Designs, partner up with others using functions, and take care of the data in an effective way.
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.