programming
- programming languages: java, PHP, (X)HTML, CSS, ruby, lisp
- databases: Informix, MySQL
- servers: Apache, Jboss
- text editors: Emacs, vim
- IDE: jdee, NetBeans, Eclipse
- graphical editors: GIMP, Inkscape
- typesetting systems: TeX (texlive), DocBook, OpenOffice, FOP
- operating systems: GNU/Linux (Debian), AIX, MS Windows, ...
- butterflies ;-)
