I subscribe to the mailing list with Edweb and almost every day they send out free webinars for teachers. I have done a few webinars and they range in content but they have all been interesting. Edweb is also a community for teachers so if you are interested in building or creating your personal learning network (PLN), Edweb is a good place to start. The website is american and follows the Common Core but it is very good and easy to use.
Mathcraft is a webinar that is taking place July 17th, you can sign up on the link and it is free. The teacher who is presenting has been using Minecraft in his classroom and has seen math proficiency go from 18% to 83%.