UK Serious Games Conference/ Global report

We are a networking trade association tasked with exploring the new gen of simulations and serious games in learning. Could folk let me know what they think are the leading tools in the serious games/learning space and what the key differences are in terms of dev? Your sterr would be really helpful to the report.

We are exploring this further in the first UK Serious Games conference coming up May 25-26th in London. www dot applyseriousgames dot com. Hope to hear from you!
Georgie