Basically, Choice of Games do gamebooks for online play, Android, iPhone and other smart phones. These games are wonderfully eclectic. As well as a game where you play a dragon, you could also play a vampire, a sailor or someone who is trying to find romance.
I enjoyed Choice of the Dragon as for starters, you play a dragon! You get to squish puny humans and aim to horde as much treasure as possible. You can also find a mate. Ashton Saylor reviews other Choice of Games here.
There is a huge range of official games and user made games for you to try. You can play them online or download them to your smartphone.
Choice of Games also has a great blog with tips on how to design your own game. This is another strength of Choice of Games - there is a big community of writers who are coming up with their own games. Choice of games are looking for writers at the moment so if you fancy writing a gamebook, take a look at their website read about them and read their faqs.