Wikipedia's article on Iraq's WMDs gives a good rundown of the international contributions:
All told, 52% of Iraq's international chemical weapon equipment was of German origin.
Around 21% of Iraq’s international chemical weapon equipment was French.
About 100 tons of mustard gas also came from Brazil.
The United Kingdom paid for a chlorine factory that was intended to be used for manufacturing mustard gas
An Austrian company gave Iraq calutrons for enriching uranium. The nation also provided heat exchangers, tanks, condensers, and columns for the Iraqi chemical weapons infrastructure, 16% of the international sales.
Singapore gave 4,515 tons of precursors for VX, sarin, tabun, and mustard gasses to Iraq.
The Dutch gave 4,261 tons of precursors for sarin, tabun, mustard, and tear gasses to Iraq.
Egypt gave 2,400 tons of tabun and sarin precursors to Iraq and 28,500 tons of weapons designed for carrying chemical munitions.
India gave 2,343 tons of precursors to VX, tabun, Sarin, and mustard gasses.
Luxemburg gave Iraq 650 tons of mustard gas precursors.
Spain gave Iraq 57,500 munitions designed for carrying chemical weapons. In addition, they provided reactors, condensers, columns and tanks for Iraq’s chemical warfare program, 4.4% of the international sales.
China provided 45,000 munitions designed for chemical warfare.