Watch the slides on http://ivansanchez.github.io/leaflet-vs-openlayers-slides/, or clone this repository and open up slides.html in any decent web browser.
The slides are organized in sections (arrow key left/right). To see slides within a section, use arrow key up/down.
The slides use Reveal.js, Leaflet and Openlayers. They are free software projects and I guess you're cleverenough to check their licenses if you need to.
The slides themselves are CC-by-sa.