Description: HackADay is a blog that publishes articles daily about hardware and software hacks, covering topics like electronics, programming, 3D printing, and more. It features everything from small Arduino-based projects to large open source hardware initiatives.
Type: software
Pricing: Open Source
Description: Stack Overflow is a popular question and answer site for programmers. Users can ask coding questions and receive answers from a community of developers. The site has a reputation system to rate helpful responses.
Type: software
Pricing: Subscription