The stared (*) tools are not completely open source, though free in some sense.

• Browser : *Netscape 6.2.3, Mozilla 1.0
• Document File Format : XHTML + CSS
• Complete Office Package : OpenOffice.org 1.0
• Programming IDE : jEdit 4.0, NetBeans
• Compilers : J2SDK 1.4.0_01 (Java), GNU Compiler Collection - GCC
• Image File Format : PNG (static), MNG, *GIF (Animated)
• Image Editor : GIMP
• Build Tool : Apache-Jakarta-Ant 1.4.1, GNU Make (of GCC collection)
• UML Editor : BlueJ, ArgoUML
• XML Parser Transformer : XALAN for Java and C
• In Memory Cache : XML DOM
• Database : XML, Interbase (firebird?)
• E Books : Project Guttenberg (ASCII Text), HTML Writers Guild (XML)
• Utilities (Compression, Converters...) : MinGW, GnuWin32 utilities (Source Forge)
• Operating System : Linux
• Application Server : JBoss 3.0 (Java)
• Compiler Compiler : JavaCC 2.0
• Security Architecture : GNU Privacy Gaurd
• Servlet Container : Apache Tomcat
• Web Server : Apache
• Test Harness : JUnit (Java)