Jyothi is a Hindu calendar/Panchanga that shows real-time tithi, nakshatra, lagna and other information for any date/time for the current location. The data is accurate for any location in the world. Note that dates/times will vary by location and will not always match the Indian time of the event.
It creates a calendar named Jyothi and pushes key events such as Ekadashi, Pradosham, etc, and festivals such as Janmashtami, Deepavali, etc, to this calendar.
This is the Amantha calendar (month ends on New Moon) that is used in South India, Gujarath, West Bengal, Assam and Sikkim.
This app is free to use and claims no copyright.