GitBuilding is an open source program for writing hardware build instructions using Markdown. GitBuilding uses your tags and meta-data to automatically generate and insert bills of materials into your documentation. It correctly links different steps to one another (even when you have mutliple variants), shows previews of 3D files and lets you easily include links to generated zips and other files in the correct places. Finally, you can output the entire documentation in pure Markdown, HTML or P