I can't speak much about Brits or Americans but the short answer is yes, non-germans fought for Germany in WW2 in the tens of thousands.

Many were recruited from occupied and neutral countries into the Waffen SS formations. While the Waffen SS fought alongside the wehrmacht it was a separate organization with a much stronger nazi ideological element compared to the Wehrmacht (not that the regular army was not nazified).

Indeed many of the SS volunteers from the non-german countries came from local nazi or fascist organizations. Right wing ideology was a strong motivator, as was anti-communism (often conflated with anti-semitism as judeo-bolschewism). In fact some of the last troops defending Hitlers bunker in Berlin in 45 were Scandinavian SS volunteers from the Nordland unit.

Many SS volunteers were prosecuted after the war in their home countries with example punishments ranging from a few years in jail (Denmark) to execution (French troops from the Charlemagne division).

You can look all of this up online (google foreign volunteers in waffen SS).

An old but decent book is George Stein "The Waffen SS: Hitler's Elite Guard at War, 1939-45" which covers Waffen SS as such as well as some about the foreign volunteers.

http://www.amazon.com/The-Waffen-SS-Hitlers-1939-45/dp/0801492750

On the Eastern Front, Hilfwilliger, or Hiwis, helped the Wehrmacht with supply and services. They numbered in the hundreds of thousands and were a mix of Poles, Ukrainians and Baltic state people. Besides them there were a smaller.number of combat units made up of Ukrainian nationalists. Thus the "Nazi" charges in the current troubles there.

And then you have an assortment of slave labourers, prisoners and starving Eastern Europeans who "volunteered for the regular Wehrmacht and were formed into Ost-battaliins and used in France mostly. and quite a few were in Normandy.

with regular Wehrmacht officers and NCOs, they put up a fight for a.time.but generally surrendered at the first chance they had.

Best story is a Korean impressed by the Japanese, captured in the battle of Ghalkin Gol. fought for.the Russians and was captured at the Eastern front. wound up in Normandy and was captured by the Americans. He settled in Illinois..

source: many years reading about wwII

http://www.feldgrau.com/rvol.html

http://thomo.coldie.net/2007/05/07/korean-soldiers-in-ww2-german-army/

http://weaponsandwarfare.com/?p=1342

and this is a good.wiki link http://en.m.wikipedia.org/wiki/Yang_Kyoungjong

There were many foreign units in the SS who were recruited from pro-fascist groups in eastern Europe and anti-Jewish groups. These include units from Croatia, Norway, Serbia, and Ukraine that I know of for sure. There were also several units comprised of entirely Muslims for diverse backgrounds but mostly of European descent with some arriving from more disparate locations. All the foreign units I know of were under the command of the SS and were mostly used as throw away units for the riskiest, lowest success assignments and most units had very high desertion rates.

Absolutly.

In the case of France we had the Division Charlemagne(http://en.wikipedia.org/wiki/33rd_Waffen_Grenadier_Division_of_the_SS_Charlemagne_(1st_French)) which was made up of French people sharing the Nazi ideals. They mainly fought against partisans in East Europe and on the Eastern front against Russia but the division did not have artillery support or anti tank weapons so despite selling their lives dearly in most cases they lost a lot of men against the Russian.

Some of them have survived long enough to make a last stand defending Hitler's bunker against the Russians.

Five of them have then been captured while they were fighting along with other units against the US army in the South of Germany. The US amy gave them to French Général Leclerc who briefly interrogated them before executing them summarily. The French then left their corpses to rot, refusing to bury them. The US army buried them hastily later.

Robert Forbes "For Europe, The French volunteers of the Waffen SS"

Eric Lefebvre "La division Charlemagne, des Français dans la SS"