Total number of 150 countries now under this scheme
This information was posted on Incredible India's official Facebook page as follows:
The 37 countries are: Albania, Austria, Bosnia & Herzegovina, Botswana, Brunei, Bulgaria, Cape Verde, Comoros, Cote d'lvoire, Croatia, Czech Republic, Denmark, Eritrea, Gabon, Gambia, Ghana, Greece, Guinea, Iceland, Lesotho, Liberia, Madagascar, Malawi, Moldova, Namibia, Romania, San Marino, Senegal, Serbia, Slovakia, South Africa, Swaziland, Switzerland, Tajikistan, Trinidad & Tobago, Zambia and Zimbabwe.
The complete list of countries for whom e-tourist visa facility is available can be seen on the official website of Indian e-Tourist Visa, where visitors can avail e-tourist visa by a simple 4 step process of application.
 Official website of Indian e-Tourist Visa