Non-institutional Scholarships, apart from the military and the National Health Service Corps, don't really exist. You can find some research type scholarships from all the specialty organizations but this is typically for research done by medical students in medical school. You can also check for scholarships offered at the local level from organizations like Kiwanis, Rotary Club, etc. Check with the financial aid office at your school to see what scholarships medical students have received in the past.