Hi.. any learning education tv programs, dvd or apps to intro for toddlers age 18 months onward, thanks.

I've been letting my 23 month old watch barney, blue's clues and Sesame Street DVDs since she was 12 months, for 30min to 1h periods. These teach her things like ABCs, good manners, how to count, about trees, music etc. and she's memorised and learnt a number of songs from there and we sing along sometimes. I borrow them from our public libraries so no money has been spent. :)