Free is a word that makes me smile! Here are some sites that offer free webinars!
Simple K-12 offers free webinar sessions as well as paid professional development modules. You will also find a community in which you can connect with teachers who have common interests and backgrounds. After spending a year on SimpleK12, I can say it is easy to use and worth the time!
TeachersFirst is a great website for scheduled webinars. Just this school year, they offered a 6 part series on Google Apps in schools. Should you miss a webinar, you can always find it in the archives. The site also offers a great variety of resources according to subject and topic.
EdWeb.net offers many webinars for teachers. Additionally, you can connect with other teachers, join communities, and gain incredible information through blogs and news articles. The webinars are offered frequently!
Education Week is a massive website filled with content. However, they do offer extremely beneficial webinars! If you are curious about technology integration and core subject areas, this is the place to start!
This is not the be-all-end-all list of webinar websites! However, these sites have offered some incredible professional development opportunities for me and many of my colleagues. Learning should not stop with school offered PD! We are called to be life long learners! Find a great learning network and stick with it!
Remember: The more you grow, the more your students will grow!