KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
TypeSlab - Simple, shareable typographic posters
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.
Bold - Ultra-fast anonymous publishing platform.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Font Candy - Font Candy lets you mask your photos with captions or simply overlay your images with text.