David Tolpin has announced PreTI, a set of open-source Java-based, Relax NG-driven authoring tools that "implements a different approach to input of structured documents." Currently available are both a PreTI jEdit plugin (docs) and a toolkit (docs) for creating "markup rules" useful with PreTI implementations.

Tolpin writes that PreTI is based on three key assumptions:

Time will tell if PreTI turns out to be as usable and successful as the last major project Tolpin focused his energies on: the commercial XSL-FO rendering engine XEP (he worked on it for four years as CTO and develpment lead).