rivt
rivt is an open source Python project for writing and distributing engineering documents. Documents are written in rivt markup inside a Python file (.py) referred to as a rivt file.
A rivt file outputs a formatted doc file as text, HTML or PDF. Organized docs make up a rivt report. This site is an example of an HTML rivt report.
rivt is an open source framework that integrates with other tools and llbraries. The framework is described here.
This is a small rivt file example. Larger examples are here. A search interface for discovering rivt files on GitHub is here.