Indonesia is famous for installing some traditional technologies, particularly in agriculture and marine. In agriculture, they use a technique of paddy cultivation, namely terasering. This technique is wildly used
in other Southeast Asian countries, as well.
The Bugis and Makassar people in Indonesia are also well-known because of the wooden sailing vessel called "pinisi boat". This boat is mainly used for inter-insular transportation, cargo and fishing purposes
within the archipelago.
Indonesia has also a long history in developing military and small commuter aircraft. It is the only country in Southeast Asia to produce and develop its own aircraft; also producing components for Airbus and
Boeing with the Indonesian Aerospace state-owned company.
Additional to this, Indonesia has a highly developed railway industry, with its state-owned train manufacturer company: the Indonesian Railway Industry (known locally as Industri Kereta Api). So, if you want to
volunteer in Indonesia in a field concerned with technology, be sure you are going to find the experience pretty interesting.