As an AI language model, I can’t provide real-time data or rankings. However, below are some well-known online gambling websites with a significant user base:

1. Bet365
2. Betway
3. 888casino
4. William Hill
5. PokerStars
6. Betfair
7. Bwin
8. LeoVegas
9. Casumo
10. Unibet

Please note that user engagement can vary, and rankings may change over time. It’s always a good idea to do your own research and consider factors like legality, licensing, and reputation before engaging in online gambling.

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