Slide Rocket is another free presentation tool that you can use online.  If you are tired of PowerPoint, it might be an option you'll like.  I created an example and put it on the presentation tools page if you want to check it out.  There were options on Slide Rocket that I didn't apply in my presentation.  Charts, tables, shapes, videos, audio and even a comment section are available.  Go to their site and consider signing up for the free version so you can check it out.  Slide Rocket

Want to let your students have a little fun?  Introduce a lesson with ToonDoo, which allows you to create and save a cartoon.  Capture the embed code and put it on your website, or just share the cartoon with a class.  The students will like trying it themselves.  It's easy and even better, it's free!

There's a great new tool for presenting information to students or teachers.  It's sort of a zooming PowerPoint that changes directions.  Free, just sign up and start creating.  I'm going to give you a link to a great example by Peter Pappas.  He uses Prezi to create an instructional video on The Reflective School.
http://prezi.com/z-iozettlllo/the-reflective-school-by-peter-pappas/