Desmos, the company known for its online graphing calculator, recently released a new online geometry tool. Desmos Geometry is designed to help students understand geometry concepts through the use of drawing and diagram manipulation tools. Your students can use Desmos Geometry or you can use to create demonstrations. Desmos has created a page of resources for learning how to use Desmos Geometry.
It's important to note that Desmos made clear in its launch announcement that Desmos Geometry is meant to be a fast and light tool, it's not meant to duplicate the features of tools like Geogebra.