The first website that I visited was http://www.cast.org

I found this webpage to be extremely helpful in two areas.  The first part that I found was the UDL Lesson Builder, that provides educational materials for all teachers and provides varying levels of support.  The UDL Lesson Builder provides you with various entry points for educators and other professionals to get started.  When you visit this web page, you may explore model UDL lesson plans or create, save and edit your own UDL lesson plans.  There are a variety of other tools to create and adapt lessons that will ultimately increase access and participation in the general education curriculum for all students.