Wikifactory - Engineer the future with Wikifactory. Wikifactory unifies teams in real-time, enabling efficient communication, streamlined workflows, and accelerated time-to-market.
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
HackADay - Hackaday.io is a platform for people who like to build things.
SimilarSites - Easily find more sites like those you like.
Instructables - DIY How To Make Instructions
Product Hunt - A website that lets users share and discover new products