Sometimes the most successful startup ideas come from people building tools to solve their own needs. Such was the case with Dafydd Stuttard, a security expert who goes by Daf. Nearly two decades ago, living in the small market town of Knutsford in Cheshire in the northwest of England, Daf was working as a security consultant for different clients. On the side, he built apps that he could use himself to speed up some of the more routine parts of his work. He would give each tool a random name, u...