The Spartan poker : https://www.spartanpoker.com/ Spartan poker is one of the oldest Indian poker site which has good players pool and which tournament guarantees huge payout at low buying comparatively.
PokerBaazi : https://www.pokerbaazi.com/ Pokerbaazi is another big and old Indian poker site which has a good player traffic and has good tournament structures available for their players. PokerBaazi is also know for bringing its unique tournament named "The Money maker" and "National Poker Series". The moneyMaker guarantees biggest tournament payout till date in Indian Poker circuit, and NPS give everyone a chance to play the skill game at national level for free through their qualifier rounds.
9Stacks poker : https://www.9stacks.com/ 9stacks also offers good poker action all the time and have good tournaments running round the clock. 9stacks is also known for their home grown website and app for poker.