M3D is another extension of plain MetaPost for 3 dimensional graphics. While the author claims it should not be regarded as stable, he believes it has value simply as a source of ideas for those who wish to implement 3D graphics in MetaPost.
The package (stable or not) exhibits some interesting abilities, both in the package manual and in the gallery that comes with the distribution.
The author is Anthony Phan.
License: lppl Catalogued: 2015-08-03