Here is a list of organisations I have assisted in. Click on the links to get involved.
Asia
Phase Nepal : Mentoring Villiage Health Care workers in rural Nepal. Commitment minimum 2 weeks.
Institute for Rural Health Studies: Mentoring Village Health workers in Telengana, South India. Ideal for General Practitioners. Commitment minimum 2 weeks.
Comprehensive Rural Health Project is an incredibly successful community health development project which has spread its model worldwide. It also runs courses on community health development and accepts visitors.
Mae Tao Clinic on the Thai Burmese border assists Burmese people with healthcare. They accept final year medical students to specialists. This is an incredible set up and service to people who really need it.
Africa
Africa Health Placements will help you to work in a government hospital in South Africa. They will arrange your paperwork and you will be paid well for the work here.
Europe
Doctors of the World have many opportunities for GPs and nurses to work across Europe with the refugee crisis. I have just returned from Greece.
They also have a clinic they run in London called Project London for people who are struggling to access health care in the UK.