This repo contains a short (~30 mins, went a bit over the target) presentation aiming to describe the basic concepts of the Akka actor core.
To presentation is contained in prez.adoc, an Asciidoc file intended to be run over the slidy backend, like so:
asciidoc --backend=slidy prez.adoc
and view prez.html. There are two references to the apps in the demo projects in the slides, should be pretty straightforward to figure out.
You can also view the raw text of prez.adoc, which contains notes for the presentation as comments.