When asked what tools an instructor or student might use for online presentations I could respond at length. However, here is a brief list of ones you might try:
- Jing (Techsmith)
- Screencastify (Google Chrome plugin)
- VCASMO (online tool, slides and video)
- Keynote (I love this!)
- Prezi (think carefully, you can have sound, but maybe not as you want)
- Explain Everything (perfect for your iPad)