HackADay is described as 'Hackaday.io is a platform for people who like to build things' and is a Social Network in the social & communications category. There are four alternatives to HackADay, not only websites but also apps for a variety of platforms, including Android, Windows Phone, Self-Hosted and SaaS apps. The best HackADay alternative is Instructables. It's not free, so if you're looking for a free alternative, you could try Instructables or Wikifab.
From useful and entertaining how-tos and hacks, to delicious recipes and outrageous inventions, Instructables is the place to explore, document, and share your creations.
Wikifab is a wiki-based site. The platform documents instructions for simple and technical projects. You can create new tutorials for projects or make edits to current projects to enhance them.
Engineer the future with Wikifactory. Wikifactory unifies teams in real-time, enabling efficient communication, streamlined workflows, and accelerated time-to-market.
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Hackaday is more news and interesting electronic and computer-related "hacks", Instructables is more general and tutorial-like