Play'n Go

You get:
300% deposit bonus up to $15,000 + 50 free spins

You get:
270% deposit bonus up to $20,000

You get:
100% deposit bonus up to 500 EUR
Daily Giveaways & Cashback, and if you manage to join their VIP Club, you can expect to get even more lucrative bonuses

You get:
100% Deposit Bonus Up To 5 BTC
+ 100 Freespins

You get:
Free RooWards Rakeback boost

You get:
100% deposit bonus up to $5,000 + 80 FREE SPINS

You get:
Get up to 50% commission back on every bet you place

You get:
Up to 15% rakeback on all your bets!