HTML online documentation (in german only)

SelfHTML by Stefan Münz
and SelfHTML aktuell

PHP online documentation (in german only)

SelfPHP by Damir Enseleit

HTML Editors

http://www.pspad.com/ (freeware)

http://www.meybohm.de/ or
http://www.qhaut.de (both lead to the same program)

Freeware Image Viewers/Editors

IrfanView

The GIMP

Web Browser

Mozilla