1. Corba component model webpage, http://www.omg.org/
2. Enterprise java beans webpage, http://java.sun.com/products/ejb/
3. Netfilter webpage, http://www.netfilter.org
4. Tina webpage, http://www.tinac.com
5. Apache. Xerces2 webpage, http://xml.apache.org/xerces2-j/