The project is homed here: https://codeberg.org/dlowe/metaspectre/
Differences from the Hyperspec (from the README):
- Most importantly, it is free to modify and distribute.
- The original TeX is very hard to parse and use for things other than
generating a printed copy. The Hyperspec is an HTML rendering which
can be parsed as HTML, but loses a lot of information. The Metaspec
has an easily parsed intermediate form that can be used for all kinds
of purposes, like converting into lookups.
- Math equations are rendered using MathML.
- Includes the acknowledgements and appendix sections.
- Uses progressively enhanced Javascript to provide search and
light/dark theme switching.
- Incorporates over 145 patches for content, using corrections
accumulated over the years, and documented in the errata page.
- Includes TeX comments, which can contain interesting historical data.
- Includes links and identifiers to bibliographical references.