The slot software providers we list and review here, along with their massive slot portfolios, have built a reputation in the industry. What is more, they have their games tested and proven fair by independent companies on a regular basis, and dedicate their work to impeccable service. Hence, the only difference between the demo free version and the real-money gameplay of their slot releases is the need for a cash wager. The former gives players a chance to test out the game design and mechanics, and get to know the actual gameplay before putting some of their hard-earned money on the line, or better yet, payline.