TEI produces the TEI Guidelines and associated software
The TEI is an international and interdisciplinary standard used by libraries, museums, publishers, and academics to represent all kinds of literary and linguistic texts, using an encoding scheme that is maximally expressive and minimally obsolescent.
The EpiDoc Collaborative is developing specifications and tools for standards-based, digital publication and interchange of scholarly and educational editions of documentary and literary texts like inscriptions and papyri.
The link below will take you to the EpiDoc home page on this site.