AquaPath is a free Cocoa-based developer tool for Mac OS X Tiger that allows you evaluate XPath expressions against any XML document and view the result sequence in a dynamic, intuitive tree representation.
Pentaho Data Integration Community Edition (PDI CE) also known as Kettle. Pentaho Data Integration delivers powerful Extraction, Transformation and Loading (ETL) capabilities using an innovative, metadata-driven approach. With an intuitive, graphical, drag and drop design environment, and a proven, scalable, standards-based architecture, Pentaho Data Integration is increasingly the choice for organizations over traditional, proprietary ETL or data integration tools.