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

• Browser : *Netscape 7.1, Mozilla 1.5
• Document File Format : XHTML + CSS
• Complete Office Package : OpenOffice.org 1.1
• Programming IDE : jEdit 4.1, NetBeans 3.5.1, Eclipse 2.1.2
• Compilers : J2SDK 1.4.2_02 (Java), GNU Compiler Collection - GCC (use MinGW)
• Image File Format : PNG (static), MNG, *GIF (Animated)
• Image Editor : GIMP 1.2.4 win32
• Build Tool : Apache Ant 1.5.4, GNU Make (use MSys with MinGW)
• UML Editor : BlueJ 1.3.0, ArgoUML 0.14
• XML Parser Transformer : SAX, XSL
• In Memory Cache : XML DOM
• Database : XML, Interbase (firebird?), MySQL 4.0.16
• E Books : Project Guttenberg [official] (ASCII Text), HTML Writers Guild (XML)
• Utilities (Compression, Converters...) : MinGW 3.1.0, GnuWin32 utilities
• Operating System : Linux
• Application Server : JBoss 3.2.2
• Compiler Compiler : JavaCC 3.2 (java.net)
• Security Architecture : GNU Privacy Gaurd
• Servlet Container : Apache Tomcat 4.1.29
• Web Server : Apache HTTPD 2.0.48
• Test Harness : JUnit 3.8.1