This document provides an overview of open-source thinking tools that can be used in digital product development. It discusses two tools in particular: 1. X10 is presented as a tool for early sketching to generate many design options by multiplying elements, metrics, or perspectives by 10. 2. Good, Bad, Better is described as a mechanism for quick iterations on a concept by identifying what is good, bad, and transforming the bad into something better. The document advocates applying these thinking tools at the idea generation stage before beginning to code, but acknowledges hackathons provide a safe environment to build and validate ideas through a process of parallel attempts and technology-led innovation.