The West and The Occupying Nazi Forces in South Holland managed a joint discovery as to the nature of coeliac disease quite late in the war.I think it fair to say that all these things were advanced much more by the allies. Such as:
Rehabilitation of spinal injuries
Drowning related research in UK/US
Miniturisation of electronics
New metal alloys
New metal working methods
Nuclear science and technology
Did the Nazis have any technology that was not being worked on in the West? Some might suggest the V2 rocket - but the Americans had their own rocket pioneer, Robert Goddard.