Greg Reese and  M.Angeles Lopez Malo, who told me how to represent the data properly.

Sven Neumand and the plug-in skeleton he sent to me.

Johnny Tevessen, for his example on automake/autoconf.

Mario De Weerd, who updated GFourier to Gimp 1.2.

Lots of GIMP and plug-ins developers, whose work I searched for help.

Several other people, who sent ideas and bug reports.