Project under development to produce a digital edition of the Mishnah. Features: xml/TEI encoding of manuscripts; collation of witnesses; synoptic and apparatus presentation; statistical tools. See the blog for discussions on challenges in using the Collatex tool to develop an apparatus criticus.
A demonstration page highlights the features that are planned. Even though inchoate as of September 2012, this project represents one of the more advanced studies in the creation and display of an open-source critical edition.