1. Apache Axis2. Apache Axis2/Java is a Web service engine implementing SOAP. http://ws.apache.org/axis2/ (accessed 2009-03-30)
2. Apache Lucene. Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. http://lucene.apache.org/ (accessed 2009-03-30).
3. Apache Tomcat. Official reference implementation for the Java Servlet and JavaServer Pages technologies. http://tomcat.apache.org/ (accessed 2009-03-20)
4. Becerra-Fernandez, I. (2006). Searching for experts on the Web: A review of contemporary expertise locator systems. ACM Transactions on Internet Technologies, (6)4, New York: ACM Press. 333–355
5. Berio, G. and Harzallah, M. (2005). Knowledge Management for Competence Management. J.UKM 0(1). 21–28