Dear Iman
Children's literature does not change with internet a great deal. There is and has always
been a writer, his/her mind and, his computer/notebook and his key-board/pen.
Of course there are websites where writers/kids publish their works digitally. I came across
several of them when I was searching in the domain of children's literature.
And about the software for kids I have no idea.
Best wishes
Fatemeh