David Tolpin has released RNV 1.3, an open source Relax NG Compact Syntax validator written in ANSI C. Version 1.3 improves performance and adds a VIM plug-in. RNV is published under a BSD license.
Eric S. Raymond has released version 1.6 of doclifter, an open source tool that transcodes {n,t,g}roff documentation to DocBook. He claims the "result is usable without further hand-hacking about 95% of the time." This releasehas simpler entity resolution logic, and removes the -s and -x options. Doclifter is written in Python, and requires Python 2.2a1. doclifter is published under the GPL.