These are all established and recognized platforms bringing fair play to players, they have strong random generator, well-organized help, friendly menu and interesting games.  

My favorite software platform is Microgaming, because I really like its help. I like to play slots, although I don’t play for real, but I like them and play for fan, and to understand all rules I always use the help. And moreover most Microgaming casinos support other languages.  Wagerworks and RTG casinos are also very good, they offer really fantastic games. I didn’t try all software platforms, but from my experience I know that the listed above software platforms are trusted.