The ghaychak or gheychak is a bowed lute used in Iran, Afghanistan, Pakistan, and Tajikistan. (Source: Wikipedia) It is often used in Balochi folk music, which is popular in Iran, Pakistan, and Oman.
The Gyaling is a traditional woodwind instrument used in Tibet and Nepal. In order to play the Gyaling, you must use a circular breathing technique. The Gyaling is often played during rituals and ceremonies.
The Indian harmonium is also known as samvadini, peti ("box"), or baja, and is generally smaller in size than traditional European harmoniums. There are differing schools of thought as to the use of the harmonium in Indian classical music, with some musicians noting that the instrument is unable to produce slides between notes, while others appreciate the harmonium's ease-of-use and amplified drone sound. The harmonium is often used in North Indian classical vocal music.