Lucidchart is a good tool for creating flowcharts, mind maps, and graphic organizers. I've been recommending it for a couple of years because it can be added to Google Apps for Education accounts at no cost.
This week LucidChart introduced a new presentation mode that enables you to turn your diagrams into slide presentations. When you enable the presentation mode you can select elements in your diagram to become individual slides. You can re-size each element to make it fit your slides the way that you see best. When you're ready to present just click the presentation button and you can flip through the slides just like you would in PowerPoint, Google Slides, or Keynote. Watch the video below for a demonstration and you'll notice there's a little bit of Prezi elment to LucidChart's presentation mode too.
Applications for Education
LucidChart has always been a good tool for high school and college students to use to organize ideas around a key concept. The presentation mode will make it easy to take those ideas and flip them into an organized presentation.
Presentation mode is a premium feature of LucidChart. But remember that K-12 teachers and students get the premium features for free when they apply for a LucidChart education account.