The website Automaton Simulator allows to create and simulate DFAs, NFAs, and PDAs (graphically). (If you create automata that you think are worth sharing, please let me (Pascal) know.)
The JFLAP package allows you to simulate all kinds of automata and machines.
The recordings of the current year will be published via Wattle360, which will be linked from Wattle.
Our page on the Lectures provides links to presentations of the textbook authors which might nicely complement the explanations provided in this course.