Flowboard is an iOS-based presentation tool that looks and functions similarly to a photo gallery. Users can create slides that combine images and text or embed content from Dropbox, Instagram, Facebook, and other online sources.  Flowboards can be shared by URL or embeded into a site.

Here’s an example:

View on FlowVella – Presentation Software for Mac iPad and iPhone

Site: https://flowboard.com/
Pros: Good for picture-rich presentations and portfolios that link to other sources; portfolios can be viewed using a web browser
Cons: Presentations can be made solely on iOS devices.