Deutsch für Ausländer (Comprehensible Input For German) | Beginning with audio recording
Deutsch Nach der Naturmethode (German by the Nature Method) | Chapter 1 with audio recording
Elementary German Series by Peter Hagboldt (a collection of five graded readers, can be used by absolute beginners).
Preparatory Book of German Prose (Gothic font)
Easy German Poetry for Beginners (Gothic font)
Felix und Franzi from the Goethe Institut forms part of their freely accessible online program.
Piggeldy und Frederick is also just a small stretch for beginners.
And challenging for a beginning language learner, but also that which might be the most interest is the channel Annas und Pias Tiere.
Sing mit mir – Kinderlieder has a lot of videos of songs with lyrics subtitled.