Pekka Enberg has posted version 0.2.17 of XML Indent, an open source (GPL) "XML stream reformatter written in ANSI C" that "is analogous to GNU indent." This release supports multiple input files on the command line.
Altsoft N.V. has posted a beta of Xml2PDF 2.0, a $49 payware Windows program for converting XSL Formatting Objects documents into PDF files. Version 2.0 improves XSL-FO 1.0 and 1.1 draft support, adds support for SVG, and accepts XHTML as an input format.