There is a link to http://atterer.org/sites/atterer/files/2009-08/jigdo/jigdo-win-0.7.2.zip on http://atterer.org/jigdo/
Vague alternative ideas: - Install a small Debian in a virtual machine on some MS-Windows with network access and use it to assemble the ISOs by help of "jigdo-lite" from package "jigdo-file". - Boot a Debian Live system, check for jigdo-lite being present, install "jigdo-file" if needed, mount a disk partition, and assemble the ISO there.
> Otherwise is there a sort of "online jigdo" in order to build a custom > installation ISO with needed packages and related dependencies?
That would be the debian-cd software itself, i guess. Somebody would have to donate the resources to create large ISOs on demand. That's even more a load than offering a few BD sized static ISOs. (And then one would have to make it ready to be operated remotely by possibly greedy users ...)