Are tools like Scratch, Alice, and GameSalad considered on topic? I see in a lot of questions users saying in the comments that the question is too simple for the site, since it is for "experts", and these tools seem to be for beginners to programming.
Yes, visual programming languages are on-topic on Stack Overflow. Individual questions may be too simple if their answers can be found in any introductory tutorial, but we don't classify whole programming languages as off-topic just because they're aimed at beginner programmers. If you have a question that you can't find the answer to in a tutorial or book for your language, go ahead and ask it.