Open source applications and tools are the great alternative for web designers on budget. Many open source tools have equivalent features to the expensive applications, and are also free. Here you will find list of the best open source tools for web designers.

Text Editors:
Aptana Studio
KompoZer
Notepad++
Firebug
Quanta Plus
jEdit

Graphics Applications:
GIMP
Dia
Krita
Inkscape

FTP:
FileZilla
Cyberduck
WinSCP