operating systems
- Linux (Debian/Fedora/Redhat)
- MS Windows
- Mac OSX
- MS Dos
- NetBSD
- Solaris
- Novell Netware
languages
- ASP
- Assembler (8080, 68000, NT40)
- C++
- CSS
- HTML
- Java Script
- Java, since 1997 (SE/JSP/Servlets/JSF/JEE)
- Groovy
- Grails
- MS-MFC
- Pascal
- SQL (DB2, Oracle, PL/SQL, PostgreSQL)
- XML/XSLT
- toyed with: python, ruby, erlang, clojure, rust